SPATA31D1 is a symbol for the gene, SPATA31 subfamily D, member 1, in humans. Other names include: Spermatogenesis-associated protein 31D1; Protein FAM75D1; FAM75D1. The encoded protein has an amino acid length of 1576 and a mass of 175.6 kDa. Other isoforms may exist. SPATA31D1 is a member of the SPATA31 family. This gene shares homology with other species, including: Rat.