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Chemical structures of selected phospholipid (PL) classes. Only the characteristic PL headgroups are shown. “R1” and “R2” denote different acyl (or in selected cases also alkyl) chains. Please note that the majority of physiologically-relevant lipids possess a saturated and an unsaturated fatty acyl moiety at the sn-1 and the sn-2 position, respectively. Although there also are alkyl-acyl and alkenyl-acyl PL, only the ester-linked compounds are shown here.
