Receptor for hyaluronic acid (HA) (PubMed:1376732). Involved in cell motility (PubMed:1376732). When hyaluronan binds to HMMR, the phosphorylation of a number of proteins, including the PTK2/FAK1 occurs. May also be involved in cellular transformation and metastasis formation, and in regulating extracellular-regulated kinase (ERK) activity. May act as a regulator of adipogenesis (PubMed:22666460). Interacts with ANKRD26 (By similarity). Interacts with DYNLL1 (By similarity). Interacts with FAM83D/CHICA (By similarity). Ubiquitously expressed.