O Egln1 ORF13 - Hif-p4h-2|ORF13|SM-20|Phd2 SM-20 protein coding gene Hif-p4h-2 Gene Phd2 egl-9 family hypoxia-inducible factor 1 http://identifiers.org/mgd/MGI:1932286 MGI:1932286 genetic mapping