| Primary Identifier | MGI:5448057 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Top1mt |
| Transmission | Germline | Strain of Origin | 129S6/SvEvTac |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A loxP site was inserted upstream of exon 13. A floxed neomycin resistance cassette was inserted downstream of exon 14. Cre-mediated recombination removed exons 13 and 14 as well as the selection cassette. |