| Primary Identifier | MGI:2448928 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Jak1 |
| Transmission | Germline | Strain of Origin | 129/Sv |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | The gene was disrupted by replacement of exons 1 and 2 and 1.6 kb of 5' upstream sequence with a neomycin resistance cassette via homologous recombination. Absence of gene expression was confirmed by Western blot analysis of embryonic fibroblasts derived from homozygous mutant embryos. |