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Expression levels of CYP26A1 in neonatal lung 6 and 12 h after treatment with VA, RA, VARA, Am580, and VAAm580. Data were obtained as described in the legend to Fig. 4. Groups with different letters differed significantly, P < 0.05. Asterisks denote difference between 6 and 12 h (t-test), P < 0.05.
