| Primary Identifier | MGI:3604299 | Allele Type | Targeted |
| Attribute String | Modified regulatory region, Null/knockout | Gene | Rr148 |
| Transmission | Germline | Strain of Origin | 129S6/SvEvTac |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A loxP site flanked neomycin resistance gene cassette was inserted into the locus to replace the core Emu enhancer, located between the Igh J and Cmu gene segments. These mice had a complete block of V(D)JH recombination. |