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PON1, also named as PON and K-45, belongs to the paraoxonase family. PON1 hydrolyzes the toxic metabolites of a variety of organophosphorus insecticides. It can capable of hydrolyzing a broad spectrum of organophosphate substrates and a number of aromatic carboxylic acid esters. PON1 may mediate an enzymatic protection of low density lipoproteins against oxidative modification and the consequent series of events leading to atheroma formation. For glycosylated, the MW of PON1 is migrated 42-45kd. 55kd is a dimmer of isoform CRA-b. The antibody has cross-reaction to PON2 and PON3.