The effect of compound AR9 on r Sj AR enzymatic activity. The concentrations of AR9 were 5 μg/ml (triangle), 10 μg/ml (square) and 20 μg/ml (diamond). The AR9 blank was used as a control (circle). The rSj AR concentration in each group was 0.15 μM. The assay was performed independently three times. The background was removed from the data shown here.