Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Tracheal aspirate concentrations of PDGF-BB normalized to secretory component (sc) during the first 14 days of life in infants who were oxygen dependent at 36 weeks PCA (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.
