(PGD 2 ) and smaller amounts of prostaglanThe contribution of hepatocytes to liver prostaglandin din E 2 (PGE 2 ), prostaglandin F 2a (PGF 2a ), and other arachisynthesis is controversial, partly because hepatocytes of donic acid metabolites. 5 However, there is no consensus varying purity have been studied. In this study, prostawhether hepatocytes have an active cyclooxygenase pathglandin synthesis was examined in conventional and riway. 1 We previously studied this question using homogenates cin-purified rat hepatocytes that were incubated with of primary rat hepatocytes purified with ricin A chain, 6