| Primary Identifier | MGI:3582575 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Ighm |
| Transmission | Germline | Strain of Origin | Not Specified |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | The entire tandem repeat region was replaced by a Neo/loxP cassette which was later removed by crossing to a Cre recombinase transgenic strain, leaving one loxP site. The enhancer, matrix attachment regions and the I exon were left intact. |
