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POR activity levels in hepatocyte cultures and non-hepatocyte CHO cells. Exponentially growing cells were processed for microsome isolations and quantitative determinations of POR enzyme activity. Human hepatocyte microsomes (HHM) isolated from liver biopsies served as positive control, CHO-K1 cells as negative control. Data shown as arithmetic mean±standard deviation; *p < 0.05; *significant changes compared to HHM; n = 6.
