| Primary Identifier | MGI:3701074 | Allele Type | Targeted |
| Attribute String | Modified regulatory region, Null/knockout | Gene | Rr28 |
| Transmission | Germline | Strain of Origin | 129P2/OlaHsd |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A targeting vector was designed to insert the alpha fetoprotein enhancer fragment and a floxed neomycin resistance gene cassette in place of the endodermal enhancers. Transient expression of cre recombinase removed the neo cassette. |