three-day-old rabbits were given intratracheal injections of radiolabeled natural sheep surfactant , rabbit surfactant , or liposomes of dipalmitoylphosphatidylcholine that contained greater than three times the quantity of phosphatidylcholine present in the endogenous surfactant pool .
C0000039
dipalmitoylphosphatidylcholine
C1959616
phosphatidylcholine