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Feedback regulation of sterol biosynthesis at the point of DXS gene. (A) Transcript levels of DXS and PSY genes of N. oceanica induced by CLO (20 mg l-1). (B) Transcript levels of DXS and PSY genes in N. oceanica induced by TBF (2.5 mg l-1). (C) Transcript levels of DXS and PSY genes relative to actin gene (g3056) in response to cholesterol treatment (1.1 mg l-1). Samples cultured with DMSO are set as mock controls. Values are normalized to 1. Asterisks (*) indicate P values < 0.05.
