Gpnmb is a symbol for the gene, Glycoprotein (transmembrane) nmb, in humans. Other names include: Transmembrane glycoprotein NMB; Transmembrane glycoprotein HGFIN; transmembrane glycoprotein; glycoprotein NMB; glycoprotein nmb-like protein; osteoactivin; HGFIN. The encoded protein has an amino acid length of 572 and a mass of 63.9 kDa. Other isoforms may exist. Gpnmb is a member of the PMEL/NMB family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.