| Primary Identifier | MGI:1932111 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Arnt |
| Transmission | Germline | Strain of Origin | 129X1/SvJ |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A neomycin resistance cassette (pMC1neopA) was inserted into the region of the gene that encodes the basic helix-loop-helix domain of the protein. Western blot analysis using carboxy terminus antisera demonstrated that no detectable protein was present in homozygous E9.5 embryos. |