| Primary Identifier | MGI:4838169 | Allele Type | Targeted |
| Attribute String | Modified regulatory region, Null/knockout | Gene | Rr156 |
| Transmission | Germline | Strain of Origin | 129P2/OlaHsd |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A loxP site flanked neomycin resistance gene cassette replaced the most 3' set of DNAse I hypersensitive sequences (hs4) in the 3' regulatory region of the Igh gene. Subsequent Cre-mediated excision removed the selection cassette. |