protein coding gene + Gene http://identifiers.org/mgd/MGI:1924696 9530025L16Rik Heg1 LOC268884 O 4632417D23Rik 5530401I02Rik|9530025L16Rik|4632417D23Rik|LOC268884 heart development protein with EGF-like domains 1 5530401I02Rik MGI:1924696 genetic mapping