1-alkyl-2-acetylglycerophosphocholine esterase complex GO:0008247 2-acetyl-1-alkylglycerophosphocholine esterase complex platelet-activating factor acetylhydrolase complex cellular_component An enzyme complex composed of two catalytic alpha subunits, which form a catalytic dimer, and a non-catalytic, regulatory beta subunit; the catalytic dimer may be an alpha1/alpha1 or alpha2/alpha2 homodimer, or an alpha1/alpha2 heterodimer. Modulates the action of platelet-activating factor (PAF). See also the molecular function term '1-alkyl-2-acetylglycerophosphocholine esterase activity ; GO:0003847'. catalytic complex