About   Help   FAQ
Phenotypes Associated with This Genotype
Genotype
MGI:5649288
Allelic
Composition		 Krastm4.1Bbd/Kras+
Genetic
Background		 involves: 129S1/Sv * 129S2/SvPas * 129X1/SvJ * C57BL/6J * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Krastm4.1Bbd mutation (0 available); any Kras mutation (69 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
mortality/aging
premature death ( J:223433 )
• mice exhibit a reduced life span, with an average half-life of 62 weeks

hematopoietic system

immune system

growth/size/body
enlarged spleen ( J:223433 )

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)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support. 		last database update
01/13/2026
MGI 6.24 		The Jackson Laboratory