| Primary Identifier | MGI:4452055 | Allele Type | Targeted |
| Attribute String | Modified regulatory region | Gene | Rr112 |
| Transmission | Germline | Strain of Origin | 129P2/OlaHsd |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | Thymocyte enhancer E4t downstream of Cd4 (in intron 1 of Usp5) was replaced with an FRT site flanked hygromycin resistance gene cassette. Flp-mediated recombination removed the hygro cassette. Targeted ES cells carried the Rr94tm3.1Litt allele that targets the E4p Cd4 enhancer. |