Figure 2From: Elevated platelet-derived growth factor-BB concentrations in premature neonates who develop chronic lung diseaseTracheal aspirate concentrations of PDGF-BB normalized to secretory component (sc) during the first 14 days of life in infants who were oxygen dependent at 28 postnatal days (black bars) and those who were not (white bars). Data represent mean ± SEM. Numbers in parenthesis are the number of TA samples assayed per time period.Back to article page