| Primary Identifier | MGI:3621032 | 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 | The loxP site flanked neomycin resistance gene cassette was removed via cre-mediated excision from Rr320tm5Mkg, leaving the deletion of 5'HS4 encoded by nucleotides -19849 to -22561 relative to the Ey cap site. |