| Primary Identifier | MGI:5474643 | Allele Type | Targeted |
| Attribute String | Modified regulatory region, Null/knockout | Gene | Rr166 |
| Transmission | Germline | Strain of Origin | 129S6/SvEvTac |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | Two DNAse1 hypersensitive sites, termed "contracting element for recombination" or "Cer", were replaced with a loxP site flanked neomycin resistance gene cassette. Cre-mediated recombination was then used to remove the resistance cassette in mice. |