| Primary Identifier | MGI:5463412 | Allele Type | Targeted |
| Attribute String | Conditional ready, No functional change | Gene | Rr21 |
| Transmission | Germline | Strain of Origin | C57BL/6 |
| Is Recombinase | false | Is Wild Type | false |
| molecularNote | A 1740 bp region that lies 335 kb upstream of the transcription start site of Myc (Chr15:61449842-61451581 (NCBI37/mm9)) was flanked with loxP sites and an FRT site flanked neomycin resistance gene cassette was inserted upstream of the 3' loxP site. |