ENPP1 is a symbol for the gene, Ectonucleotide pyrophosphatase/phosphodiesterase 1, in humans. Other names include: Ectonucleotide pyrophosphatase/phosphodiesterase family member 1; E-NPP 1; Membrane component chromosome 6 surface marker 1; Phosphodiesterase I/nucleotide pyrophosphatase 1; Plasma-cell membrane glycoprotein PC-1; ARHR2; COLED; M6S1; NPP1; NPPS; PDNP1. The encoded protein is an enzyme with an amino acid length of 925 and a mass of 104.9 kDa. Other isoforms may exist. ENPP1 is a member of the Nucleotide pyrophosphatase/phosphodiesterase family. This gene shares homology with other species, including: Mouse.