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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Tcof1tm1Mjd
targeted mutation 1, Michael J Dixon
MGI:2386185
Summary 6 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
Tcof1tm1Mjd/Tcof1+ involves: 129S1/Sv * 129X1/SvJ * BALB/c MGI:6280679
ht2
Tcof1tm1Mjd/Tcof1+ involves: 129S1/Sv * 129X1/SvJ * C3H/HeN MGI:6280676
ht3
Tcof1tm1Mjd/Tcof1+ involves: 129S1/Sv * 129X1/SvJ * C57BL/6 MGI:3029251
ht4
Tcof1tm1Mjd/Tcof1+ involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * DBA/1 MGI:3513306
ht5
Tcof1tm1Mjd/Tcof1+ involves: 129S1/Sv * 129X1/SvJ * CBA/Ca MGI:6280674
ht6
Tcof1tm1Mjd/Tcof1+ involves: 129S1/Sv * 129X1/SvJ * DBA/1 MGI:6280678


Genotype
MGI:6280679
ht1
Allelic
Composition
Tcof1tm1Mjd/Tcof1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * BALB/c
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tcof1tm1Mjd mutation (0 available); any Tcof1 mutation (106 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
N
• Background Sensitivity: non-exencephalic mice (71 of 76) are viable with a normal lifespan

nervous system
N
• Background Sensitivity: no abnormalities are seen in the cranial or dorsal root ganglia unlike in mice on a mixed background containing C57BL/6 or CBA/Ca
• in 5 of 76 mice at E9 or older
• Background Sensitivity: decreased incidence compared to mice on a mixed background containing C57BL/6, C3H/HeN, or CBA/Ca

reproductive system
N
• non-exencephalic mice (71 of 76) are fertile

behavior/neurological
N
• Background Sensitivity: flexion of the spine or abnormal posture is not seen unlike in mice on a mixed background containing C57BL/6, CBA/Ca, or C3H/HeN

embryo
N
• Background Sensitivity: no abnormalities are seen in the neural crest migration unlike in mice on a mixed background containing C57BL/6 or CBA/Ca

limbs/digits/tail
N
• Background Sensitivity: no digit abnormalities are seen unlike in mice on a mixed background containing C57BL/6 or CBA/Ca

skeleton
N
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6 or CBA/Ca hypoplasia of the mandible/maxilla and fusions of the cervical or thoracic vertebrae are not seen
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6, CBA/Ca, or DBA/1 rib fusions are not seen
• Background Sensitivity: ossification delay of the long bones is not seen in mice on a mixed background containing C57BL/6, C3H/HeN, DBA/1 or BALB/c unlike mice on a mixed background containing CBA/Ca

vision/eye
N
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6 or CBA/Ca anophthalmia or microphthalmia are not seen




Genotype
MGI:6280676
ht2
Allelic
Composition
Tcof1tm1Mjd/Tcof1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C3H/HeN
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tcof1tm1Mjd mutation (0 available); any Tcof1 mutation (106 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
nervous system
N
• Background Sensitivity: no abnormalities are seen in the cranial or dorsal root ganglia unlike in mice on a mixed background containing C57BL/6 or CBA/Ca
• in 26 of 29 mice at E9 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1 or BALB/c

behavior/neurological
• flexion of the spine or abnormal posture in 1 of 7 mice

vision/eye
• exopthalmia or small orbits in all embryos
• exopthalmia or small orbits in all embryos

embryo
N
• Background Sensitivity: no abnormalities are seen in the neural crest migration unlike in mice on a mixed background containing C57BL/6 or CBA/Ca

craniofacial
N
• Background Sensitivity: no nasal complex abnormalities are seen unlike in mice on a mixed background containing C57BL/6 or CBA/Ca
• exopthalmia or small orbits in all embryos

growth/size/body
N
• Background Sensitivity: do not display developmental display unlike mice on a mixed background containing C57BL/6 or CBA/Ca

limbs/digits/tail
N
• Background Sensitivity: no digit abnormalities are seen unlike in mice on a mixed background containing C57BL/6 or CBA/Ca

skeleton
N
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6 or CBA/Ca hypoplasia of the mandible/maxilla and fusions of the cervical or thoracic vertebrae are not seen
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6, CBA/Ca, or DBA/1 rib fusions are not seen
• Background Sensitivity: ossification delay of the long bones is not seen in mice on a mixed background containing C57BL/6, C3H/HeN, DBA/1 or BALB/c unlike mice on a mixed background containing CBA/Ca
• exopthalmia or small orbits in all embryos




Genotype
MGI:3029251
ht3
Allelic
Composition
Tcof1tm1Mjd/Tcof1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tcof1tm1Mjd mutation (0 available); any Tcof1 mutation (106 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• newborn heterozygotes are exencephalic, fail to establish an airway, and die shortly after birth

craniofacial
• as early as E8, heterozygotes exhibit major craniofacial defects, not attributable solely to a developmental delay
• heterozygous skulls are grossly malformed
• with the exception of the supraoccipital, the bones of the skull vault are absent
• the zygomatic arch is hypoplastic and misshapen
• at E14.5 and E18, the mandibular component of the first arch is smaller
• at E14.5 and E18, the mandibular component of the first arch is shorter
• at E12.5, heterozygotes show severe retrognathia of the middle third of the face
• hypoplasia of the mandible/maxilla in all mice at E9 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• the middle ear ossicles are hypoplastic and misshapen
• at E9.5, heterozygous frontonasal processes are markedly hypoplastic
• by E10.5, heterozygotes fail to develop either medial or lateral nasal processes
• at E14.5 and E18, the maxillary component of the first arch is less distinct and displaced rostrally, and is hypoplastic
• by E10.5, heterozygotes fail to develop either medial or lateral nasal processes
• the nasal capsule is extremely dysmorphic with a midline cartilaginous protrusion
• at E12.5, heterozygotes fail to develop nasal pits
• at E14.5, while the secondary palate of wild-type mice have elevated and fused, heterozygous palatal shelves appear severely disorganized and displaced
• however, incisor and molar tooth germs appear to develop normally
• heterozygotes display an underdeveloped first pharyngeal arch resulting in the formation of a rudimentary upper lip
• at E12.5, heterozygotes display only a rudimentary upper lip
• midline nasal spear present in place of the septum in 4 of 4 embryos

respiratory system
• the nasal capsule is extremely dysmorphic with a midline cartilaginous protrusion
• at E12.5, heterozygotes fail to develop nasal pits
• midline nasal spear present in place of the septum in 4 of 4 embryos
• newborn heterozygotes fail to establish an airway, due to absence of nasal passages

skeleton
N
• Background Sensitivity: ossification delay of the long bones is not seen in mice on a mixed background containing C57BL/6, C3H/HeN, DBA/1 or BALB/c unlike mice on a mixed background containing CBA/Ca
• heterozygous skulls are grossly malformed
• with the exception of the supraoccipital, the bones of the skull vault are absent
• the zygomatic arch is hypoplastic and misshapen
• at E14.5 and E18, the mandibular component of the first arch is smaller
• at E14.5 and E18, the mandibular component of the first arch is shorter
• at E12.5, heterozygotes show severe retrognathia of the middle third of the face
• hypoplasia of the mandible/maxilla in all mice at E9 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• the middle ear ossicles are hypoplastic and misshapen
• the nasal capsule is extremely dysmorphic with a midline cartilaginous protrusion
• in 3 of 14 mice
• fusions of the cervical or thoracic vertebrae in 4 of 14 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

vision/eye
• at E8.5, heterozygotes display absence of the optic evagination
• by E14.5, heterozygotes exhibit anophthalmia (J:62928)
• in all embryos (J:89223)
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1 or BALB/c (J:89223)

nervous system
• at E8.5, elevated levels of cell death, particularly in the cephalic neural folds and neural tube
• level of apoptosis remains high throughout E9.0 to E9.5, particularly in the post-fusion neural tube
• at E9.0, most heterozygotes display a delay in the closure of the rostral neuropore resulting in exencephaly
• at E10.5, only a few heterozygotes succeed in closing their rostral neuropore but still display brain hypoplasia
• at E10.5, heterozygotes show a severely compromised midbrain development
• at E12.5, heterozygotes display a severely disorganized forebrain
• at E10.5, the entrance to Rathke's pouch is visible but smaller
• at E9.5, heterozygotes show no evidence of division of the forebrain into telencephalic or optic vesicles
• at E10.5, most heterozygotes exhibit exencephaly with neuroepithelium protruding through the open rostral neuropore (J:62928)
• in all mice at E9 or older (J:89223)
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1 or BALB/c (J:89223)
• at E10.5, the neural crest cell-derived cranial ganglia are severely hypoplastic (J:62928)
• abnormal or hypoplastic in 11 of 11 mice (J:89223)
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c (J:89223)
• at E10.5, the glossopharyngeal ganglia/nerves are absent
• at E10.5, the ophthalmic branch of the trigeminal nerve is absent
• abnormal or hypoplastic in 11 of 11 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• at E10.5, the dorsal root ganglia are underdeveloped and severely disorganized

embryo
• in 11 of 11 mice
• Background Sensitivity: not seen in mice on a mixed background containing C3H/HeN, DBA/1 or BALB/c
• heterozygotes display an underdeveloped first pharyngeal arch resulting in the formation of a rudimentary upper lip
• at E9.0, heterozygotes exhibit delayed axial turning relative to wild-type counterparts
• at >E8, heterozygotes display a generalized developmental delay of ~0.5-1 day that persists throughout development
• at E8.5, heterozygotes display smaller, rounded neural folds
• at E9.0, most heterozygotes display a delay in the closure of the rostral neuropore resulting in exencephaly
• at E10.5, only a few heterozygotes succeed in closing their rostral neuropore but still display brain hypoplasia

growth/size/body
• the nasal capsule is extremely dysmorphic with a midline cartilaginous protrusion
• at E14.5, while the secondary palate of wild-type mice have elevated and fused, heterozygous palatal shelves appear severely disorganized and displaced
• however, incisor and molar tooth germs appear to develop normally
• at E12.5, heterozygotes display only a rudimentary upper lip
• midline nasal spear present in place of the septum in 4 of 4 embryos
• developmental delay in all mice at E8 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• at >E8, heterozygotes display a generalized developmental delay of ~0.5-1 day that persists throughout development

hearing/vestibular/ear
• the middle ear ossicles are hypoplastic and misshapen
• at E12.5, heterozygotes display smaller otocysts
• the tympanic ring is misshapen and misplaced
• the tympanic ring is hypoplastic

digestive/alimentary system
• at E14.5, while the secondary palate of wild-type mice have elevated and fused, heterozygous palatal shelves appear severely disorganized and displaced
• however, incisor and molar tooth germs appear to develop normally

endocrine/exocrine glands
• at E10.5, the entrance to Rathke's pouch is visible but smaller

behavior/neurological
• flexion of the spine or abnormal posture in 3 of 14 mice

cellular
• at E8.5, elevated levels of cell death, particularly in the cephalic neural folds and neural tube
• level of apoptosis remains high throughout E9.0 to E9.5, particularly in the post-fusion neural tube
• in 11 of 11 mice
• Background Sensitivity: not seen in mice on a mixed background containing C3H/HeN, DBA/1 or BALB/c

limbs/digits/tail
• seen in 7 of 42 embryos at age E13 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
Treacher Collins syndrome DOID:2908 OMIM:PS154500
J:62928




Genotype
MGI:3513306
ht4
Allelic
Composition
Tcof1tm1Mjd/Tcof1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * DBA/1
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tcof1tm1Mjd mutation (0 available); any Tcof1 mutation (106 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Analysis of Tcof1tm1Mjd/Tcof1+ embryos

mortality/aging
• on a mixed C57BL/6 x DBA genetic background, heterozygotes die within 24 hrs of birth from respiratory arrest
• Background Sensitivity: on a congenic DBA genetic background, heterozygosity is compatible with postnatal life

craniofacial
• heterozygotes exhibit severe midfacial anomalies characteristic of severe cases of Treacher Collins syndrome in humans
• at E17.5, heterozygotes display a dysmorphic temporal bone
• at E17.5, heterozygotes display a dysmorphic frontal bone
• at E17.5
• at E17.5, heterozygotes display a dysmorphic maxilla
• at E17.5, heterozygotes display a dysmorphic premaxilla
• at E17.5
• at E15.5
• at E17.5
• at E17.5, heterozygotes display a dysmorphic nasal bone
• at E17.5, heterozygotes display dysmorphic palatine bones
• at E14.5, heterozygotes lack nasal conchae
• at E17.5, heterozygotes display a domed cranial vault
• at E14.5, palatal shelves display absence of complete midline fusion
• at E17.5, heterozygotes display cleft palate
• neonatal heterozygotes display severe frontonasal dysplasia
• at E14.5, nasal passages are poorly formed
• at E14.5, heterozygotes lack a nasal septum
• neonatal heterozygotes exhibit a shortened head in the anteroposterior direction

skeleton
• at E17.5, heterozygotes display a dysmorphic temporal bone
• at E17.5, heterozygotes display a dysmorphic frontal bone
• at E17.5
• at E17.5, heterozygotes display a dysmorphic maxilla
• at E17.5, heterozygotes display a dysmorphic premaxilla
• at E17.5
• at E15.5
• at E17.5
• at E17.5, heterozygotes display a dysmorphic nasal bone
• at E17.5, heterozygotes display dysmorphic palatine bones
• at E14.5, heterozygotes lack nasal conchae
• at E17.5, heterozygotes display a domed cranial vault

respiratory system
• at E17.5, heterozygotes display a dysmorphic nasal bone
• at E14.5, heterozygotes lack nasal conchae
• neonatal heterozygotes display severe frontonasal dysplasia
• at E14.5, nasal passages are poorly formed
• at E14.5, heterozygotes lack a nasal septum
• neonatal heterozygotes display gasping behavior
• newborn heterozygotes exhibit respiratory arrest due to defects in the nasal, premaxilla, maxilla, and palatine elements

nervous system
• at E8-E9.5, heterozygotes display a significantly high level of neuroepithelial-specific apoptosis, that is largely confined to the neural plate
• heterozygotes exhibit a significantly thinner neural plate during neural crest cell induction (E8.75)
• NCC hypoplasia is due to defects in NCC formation and proliferation, is a direct consequence of neuroepithelial-specific apoptosis, and results in hypoplasia of the cranial sensory ganglia and skeletal elements
• at E10.5, cranial sensory ganglia are formed in appropriate axial locations but appear significantly smaller and disorganized
• in culture, E8.5-E9.0 heterozygotes show a significant reduction of cell proliferation in the neural plate and neural crest
• increased apoptosis and reduced cell proliferation is caused by deficient production of mature ribosomes in the neuroepithelium and neural crest

digestive/alimentary system
• at E14.5, palatal shelves display absence of complete midline fusion
• at E17.5, heterozygotes display cleft palate

growth/size/body
• at E17.5, heterozygotes display a dysmorphic nasal bone
• at E14.5, heterozygotes lack nasal conchae
• at E14.5, palatal shelves display absence of complete midline fusion
• at E17.5, heterozygotes display cleft palate
• neonatal heterozygotes display severe frontonasal dysplasia
• at E14.5, nasal passages are poorly formed
• at E14.5, heterozygotes lack a nasal septum
• neonatal heterozygotes exhibit a shortened head in the anteroposterior direction
• neonatal heterozygotes display a reduction in the size of the head
• neonatal heterozygotes show abdominal distension

cellular
• at E8-E9.5, heterozygotes display a significantly high level of neuroepithelial-specific apoptosis, that is largely confined to the neural plate
• at E9.5, fewer migrating NCCs from r2 and r4 populate the first branchial arch and second branchial arch, respectively
• at E10.5, heterozygotes show ~22% fewer migrating cranial NCCs in craniofacial mesenchyme relative to wild-type mice
• NCC hypoplasia is due to defects in NCC formation and proliferation, is a direct consequence of neuroepithelial-specific apoptosis

embryo
• at E9.5, fewer migrating NCCs from r2 and r4 populate the first branchial arch and second branchial arch, respectively
• at E10.5, heterozygotes show ~22% fewer migrating cranial NCCs in craniofacial mesenchyme relative to wild-type mice
• NCC hypoplasia is due to defects in NCC formation and proliferation, is a direct consequence of neuroepithelial-specific apoptosis
• heterozygotes exhibit a significantly thinner neural plate during neural crest cell induction (E8.75)
• NCC hypoplasia is due to defects in NCC formation and proliferation, is a direct consequence of neuroepithelial-specific apoptosis, and results in hypoplasia of the cranial sensory ganglia and skeletal elements

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
Treacher Collins syndrome DOID:2908 OMIM:PS154500
J:112900




Genotype
MGI:6280674
ht5
Allelic
Composition
Tcof1tm1Mjd/Tcof1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * CBA/Ca
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tcof1tm1Mjd mutation (0 available); any Tcof1 mutation (106 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
nervous system
• in 31 of 33 mice at E9 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1 or BALB/c
• abnormal or hypoplastic in 6 of 6 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• abnormal or hypoplastic in 6 of 6 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

behavior/neurological
• in 4 of 4 mice

vision/eye
• unilateral anophthalmia or microphthalmia in all embryos
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

embryo
• in 6 of 6 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

craniofacial
• hypoplasia of the mandible/maxilla in all mice at E9 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• midline nasal spear present in place of the septum in 4 of 4 embryos
• increased incidence compared to mice on a mixed background containing C3H/HeN or BALB/c

growth/size/body
• midline nasal spear present in place of the septum in 4 of 4 embryos
• increased incidence compared to mice on a mixed background containing C3H/HeN or BALB/c
• developmental delay in all mice at E8 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN or BALB/c

limbs/digits/tail
• seen in 9 of 15 embryos at age E13 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

skeleton
• hypoplasia of the mandible/maxilla in all mice at E9 or older
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c
• in 4 of 4 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing C3H/HeN or BALB/c
• fusions of the cervical or thoracic vertebrae in 4 of 4 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing C3H/HeN or BALB/c
• delayed ossification of the long bones in 7 of 7 mice
• Background Sensitivity: ossification delay is not seen in mice on a mixed background containing C57BL/6, C3H/HeN, DBA/1 or BALB/c

cellular
• in 6 of 6 mice
• Background Sensitivity: increased incidence compared to mice on a mixed background containing DBA/1, C3H/HeN, or BALB/c

respiratory system
• midline nasal spear present in place of the septum in 4 of 4 embryos
• increased incidence compared to mice on a mixed background containing C3H/HeN or BALB/c




Genotype
MGI:6280678
ht6
Allelic
Composition
Tcof1tm1Mjd/Tcof1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * DBA/1
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Tcof1tm1Mjd mutation (0 available); any Tcof1 mutation (106 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
N
• non-exencephalic mice (71 of 76) are viable with a normal lifespan

nervous system
N
• Background Sensitivity: no abnormalities are seen in the cranial or dorsal root ganglia unlike in mice on a mixed background containing C57BL/6 or CBA/Ca
• in 5 of 76 mice at E9 or older
• Background Sensitivity: decreased incidence compared to mice on a mixed background containing C57BL/6, C3H/HeN, or CBA/Ca

reproductive system
N
• non-exencephalic mice (71 of 76) are fertile

behavior/neurological
N
• Background Sensitivity: flexion of the spine or abnormal posture is not seen unlike in mice on a mixed background containing C57BL/6, CBA/Ca, or C3H/HeN

embryo
N
• Background Sensitivity: no abnormalities are seen in the neural crest migration unlike in mice on a mixed background containing C57BL/6 or CBA/Ca

limbs/digits/tail
N
• Background Sensitivity: no digit abnormalities are seen unlike in mice on a mixed background containing C57BL/6 or CBA/Ca

skeleton
N
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6 or CBA/Ca hypoplasia of the mandible/maxilla and fusions of the cervical or thoracic vertebrae are not seen
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6, CBA/Ca, or DBA/1 rib fusions are not seen
• Background Sensitivity: ossification delay of the long bones is not seen in mice on a mixed background containing C57BL/6, C3H/HeN, DBA/1 or BALB/c unlike mice on a mixed background containing CBA/Ca

vision/eye
N
• Background Sensitivity: unlike in mice on a mixed background containing C57BL/6 or CBA/Ca anophthalmia or microphthalmia are not seen





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last database update
04/16/2024
MGI 6.23
The Jackson Laboratory