Hematopoietic prostaglandin D synthase is a human gene encoded by the symbol, HPGDS. It may also be known as: H-PGDS; GST class-sigma; Glutathione S-transferase; Glutathione-dependent PGD synthase; Glutathione-requiring prostaglandin D synthase; glutathione S-transferase sigma; GSTS; GSTS1; GSTS1-1; PGD2. The encoded protein is an enzyme with an amino acid length of 199 and a mass of 23.3 kDa. Hematopoietic prostaglandin D synthase is a member of the GST superfamily, Sigma family. Homologs of this gene exist in other organisms, including: Arabidopsis, E. coli, Nematode.