PE PS PC CH CH NH 3 CH3 NH cH∠CH3 CH2 -coo O CH CH CH2 CH2 o=P-0 o=P-0 o=p-0⊙ OH OH cH2一H一cH2 cH2一CH一CH cH2一H一cH2 cH一CH一cH2 CH-CH CH NH O =0c=0 =oc=0 CH >区 H > U> > phosphatidyl- phosphatidyl- phosphatidyl- sphingomyelin sphingosine ethanolamine serine choline E Figure 10-3 Molecular Biology of the Cell(@ Garland Science 2008)Figure 10-3 Molecular Biology of the Cell (© Garland Science 2008) PE PS PC