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The activities of sphingomyelin (SM) synthase (A) and neutral sphingomyelinase (NSMase) (B) in the cultured endothelial cells treated with 50 nM of lovastatin (Lov) and/or 2 μM of 27-hydroxycholesterol (27OH) for 60 h. Results are expressed as mean±S.E.M. of duplicate for each independent determination in eight experiments. *P<0.05.
