protein coding gene genetic mapping Gene SPEG complex locus http://identifiers.org/mgd/MGI:109282 MGI:109282 SPEGalpha Speg SPEGbeta|BPEG|SPEGalpha|D1Bwg1450e|SPEG|Apeg1 Apeg1 D1Bwg1450e SPEG SPEGbeta BPEG + O