| Primary Identifier | MGI:4459300 | Allele Type | Targeted |
| Attribute String | Conditional ready, No functional change | Gene | Esr1 |
| Transmission | Germline | Strain of Origin | 129P2/OlaHsd |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A loxP site was inserted upstream of exon 3 and a floxed PGK-neomycin selection cassette was inserted downstream of the same exon. The PGK-neo cassette was then exised from propeerly targeted ES cells leaving exon 3 floxed. |