SPAG11 is an alias for the gene, Sperm associated antigen 11B, in humans. Other names include: Sperm-associated antigen 11B; epididymal protein 2B; EDDM2B; EP2; EP2C; EP2D; HE2C. The encoded protein has an amino acid length of 103 and a mass of 11.4 kDa. SPAG11 is a member of the SPAG11 family. This gene shares homology with other species, including: Mouse, Rat.