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Correlation between previously reported CYP26 IC50 values using 9-cis-retinoic acid as a probe substrate and IC50 values generated using tazarotenic acid as a probe substrate for CYP26A1 (r2 = 0.78) or CYP26B1 (r2 = 0.62) in vitro activity in recombinant CYP enzymes. Lines represent unity, 3-fold and10-fold difference.
