| Primary Identifier | MGI:2656920 | Allele Type | Targeted |
| Attribute String | Null/knockout | Gene | Por |
| Transmission | Germline | Strain of Origin | 129P2/OlaHsd |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A floxed neo cassette was introduced into intron 4 and a single loxP site was introduced into intron 15 via homologous recombination. Transient expression of cre recombinase in correctly targeted ES cells resulted in deletion of the neo cassette and exons 5-15. |