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(A) Serum heat shock protein-70 (Hsp-70) on post-natal days 1 and 28 from very low–birth weight (VLBW) infants who developed bronchopulmonary dysplasia (BPD). (B) 8-hydroxy-2′-deoxyguanosine (8-OHdG) and (C) Hsp-70 from tracheal aspirates (TAs) on post-natal days 1 and 28 from VLBW infants, according to the absence or presence of BPD. The box plots show the 25th and 75th percentiles. #P < 0.05 between Day 1 and Day 28. *P < 0.05 between the BPD and non-BPD groups.
