| Primary Identifier | MGI:6856816 | Allele Type | Gene trapped |
| Attribute String | Null/knockout | Gene | Top3b |
| Transmission | Germline | Strain of Origin | (C57BL/6NCrlj x CBA/JNCrlj)F1 |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | The insertion site of the gene trap vector (pU-21T) on the genome in the embryonic stem (ES) cell line KTPU8 was confirmed to be between 1330 and 1331 base pairs of intron 1. |