order and motion of the cholestane spin label ( 3-spiro-doxyl-5alpha-cholestane ) incorporated into egg yolk phosphatidylcholine , dipalmitoylphosphatidylcholine and dimyristoylphosphatidylcholine , pure and in mixture with cholesterol , were studied at various temperatures .
C1959616
phosphatidylcholine
C0012456
dimyristoylphosphatidylcholine