| Primary Identifier | MGI:1857696 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Smad3 |
| Transmission | Germline | Strain of Origin | 129/Sv |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A neomycin resistance cassette replaced the first exon and part of the first intron, including the initiating ATG codon. |