intravenously administered [ methyl-14c ] choline chloride is maximally incorporated into alveolar surface surfactant 8 h after injection , and more than 97 % of this radiolabel is present in the phosphatidylcholine fraction of the surfactant and , of this , 75 % is associated with the dipalmitoyl phosphatidylcholine species .
C1959616
phosphatidylcholine
C0000039
dipalmitoyl phosphatidylcholine