| Primary Identifier | MGI:3707600 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Cd40 |
| Transmission | Germline | Strain of Origin | 129S1/Sv |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A neomycin resistance cassette was inserted into exon 3. |