<prompt> Prozone phenomenon is due toAntigen excessAntibody excessFalse ve reactionFalse -ve reaction  <response>: Zone phenomenon seen in agglutination and precipitation consists of 3 pas: Prozone Ab excess weak or absent precipitation reaction False -ve Zone of equivalence peak amount of precipitation. Post zone Ag excess weak or absent precipitation reaction. REF : ananthanarayana 10th ed 