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phosphatidylglycerol

(fŏs′fə-tīd′l-glĭsə-rôl′, -rōl′)
n.
  1. A phosphatidic acid that is a constituent in human amniotic fluid and is used as an indicator of fetal lung maturity when present in the last trimester of gestation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.