PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 10497182-9 1999 Finally, in the presence of platelets (which contain LTC(4) synthase), the LTA(4) synthesized from exogenous deuterium-labeled arachidonate was converted to cys-LTs to a greater degree than that from endogenous sources. Deuterium 109-118 leukotriene C4 synthase Homo sapiens 53-68