| Primary Identifier | MGI:3687192 | Allele Type | Targeted |
| Attribute String | Modified regulatory region, Null/knockout | Gene | Rr100 |
| Transmission | Germline | Strain of Origin | 129P2/OlaHsd |
| Is Recombinase | false | Is Wild Type | false |
| description | E14.1 ES cells were targeted a second time to created Cd8a |
| molecularNote | ES cells containing the Rr98tm1Welm mutation were subsequently targeted with a vector replacing the Cd8a E8i enhancer element with a floxed neomycin resistance cassette. |