TRPA is an alias for the gene, Tryptase gamma 1, in humans. Other names include: Tryptase gamma; Transmembrane tryptase; Serine protease 31; Tryptase gamma ; tryptase gamma II; tryptase gamma I; PRSS31; TMT; trpA. The encoded protein is an enzyme with an amino acid length of 321 and a mass of 33.8 kDa. Other isoforms may exist. TRPA is a member of the Peptidase S1 family, Tryptase subfamily. This gene shares homology with other species, including: Mouse, Rat, Frog.