Multiple Epiphyseal Dysplasia Due to Collagen 9 Anomaly is related to epiphyseal dysplasia, multiple, 3 and epiphyseal dysplasia, multiple, 6. An important gene associated with Multiple Epiphyseal Dysplasia Due to Collagen 9 Anomaly is COL9A2 (Collagen Type IX Alpha 2 Chain), and among its related pathways/superpathways are Extracellular matrix organization and NCAM signaling for neurite out-growth. Affiliated tissues include bone, and related phenotypes are abnormal epiphysis morphology and limb undergrowth