PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12069849-2 2002 The final step in the biosynthesis of LTC(4), the parent compound of cys-LTs, is catalyzed by a specific GSH transferase termed LTC(4) synthase, which is typically expressed in certain bone marrow-derived cells such as eosinophils and mast cells. Cysteine 69-72 leukotriene C4 synthase Homo sapiens 128-143