| Primary Identifier | MGI:2445411 | Allele Type | Targeted |
| Attribute String | Modified regulatory region, Null/knockout | Gene | Rr320 |
| Transmission | Germline | Strain of Origin | 129S4/SvJaeSor |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A 1.1 kb genomic region containing the 5' DNase I hypersensitive site 2 (HS2) was replaced with an FRT site flanked neomycin resistance gene cassette via homologous recombination. Successful gene targeting was confirmed by Southern blot analysis of mutant animals. |