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(a) Effect of 24 hours of incubation with phenolic acids (10-7M) on the activity of nitric oxide synthase (NOS) in the cytoplasm of T47D cells. (b) Time course of the effect of 3,4-dihydroxy-phenylacetic acid (PAA) (10-7 M) on the transcript of endothelial nitric oxide synthase (eNOS) and inducible nitric oxide synthase (iNOS). RT-PCR data for either enzyme were normalized for actin, and divided by the corresponding control values (control = 1 in all cases).
