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The effect of several metal ions and calcium on purified paraoxonases (PON1 and PON3) from rat liver was studied. PON1 and PON3 were also inhibited by EDTA and both enzyme activities were restored by the addition of free calcium. The reactivation by calcium was a time-dependent effect for PON1; however, this was not the case for PON3. We also studied the response of PON1 and PON3 to several inhibitors:...
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