assuming that both phosphatidic acid phosphatase and cholinephosphotransferase do not discriminate against substrates with an unsaturated acyl moiety at the 1-position and a saturated acyl moiety at the 2-position , the last two observations indicate that a considerable percentage of phosphatidylcholine molecules synthesized de novo may have a saturated fatty acid at the 2-position and an unsaturated fatty acid at the 1-position , and that remodeling at the 1-position may be important for the formation of surfactant dipalmitoylphosphatidylcholine .
C1959616
phosphatidylcholine
C0000039
dipalmitoylphosphatidylcholine