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Real-time quantitative PCR assay of CYP6A1 and opsin in pIB/Arrestin and pIB/Ctrl cells. The relative expression of CYP6A1 or opsin in pIB/Ctrl cells was considered as background. Results were expressed as mean ± standard error. β-actin was used as internal control. n = 3; *p < 0.05, **p < 0.01. The experiment was repeated three times. A: CYP6A1 expression level; B: opsin expression level.
