| Primary Identifier | MGI:2176600 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Atr |
| Transmission | Germline | Strain of Origin | 129S/Sv |
| Is Recombinase | false | Is Wild Type | false |
| description | ES cell line = D3 (129S2/SvPas) or J1 (129S4/SvJae). |
| molecularNote | A genomic fragment containing the first three exons was replaced with a neomycin resistance cassette. |