Pbx1 Pbx1b http://identifiers.org/mgd/MGI:97495 - MGI:97495 2310056B04Rik Pbx-1 pre B cell leukemia homeobox 1 O D230003C07Rik D230003C07Rik|Pbx1a|2310056B04Rik|Pbx1b|Pbx-1 Gene Pbx1a protein coding gene genetic mapping