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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID 		Rr331em1Fsp
endonuclease-mediated mutation 1, Francois Spitz
MGI:7410981
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
cx1
 		Del(15Rr316124-Rr313939)2Fsp/+
Rr331em1Fsp/Rr331+ 		involves: C57BL/6 MGI:7411333


Genotype
MGI:7411333
cx1
Allelic
Composition		 Del(15Rr316124-Rr313939)2Fsp/+
Rr331em1Fsp/Rr331+
Genetic
Background		 involves: C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
No mouse lines available in IMSR.
See publication links below for author information.
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
hematopoietic system
decreased B cell number ( J:257739 )
• reduced total B220+ B cell number
increased pre-B cell number ( J:257739 )
• accumulation of B220+ CD24- CD43+ PreProB cells

immune system
decreased B cell number ( J:257739 )
• reduced total B220+ B cell number
increased pre-B cell number ( J:257739 )
• accumulation of B220+ CD24- CD43+ PreProB cells




Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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Send questions and comments to User Support. 		last database update
09/30/2025
MGI 6.24 		The Jackson Laboratory