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Effect of hyperoxia on p16 expression. (A) Representative protein bands for p16 and loading control β-actin. (a) Normoxia and (b) hyperoxia on postnatal day 3. (c) Normoxia and (d) hyperoxia on postnatal day 7. (e) Normoxia and (f) hyperoxia on postnatal day 14. (B) p16 protein expression in lung fibroblasts. n=5 for each experiment group. **P<0.01. p16, p16INK4a.
