The zone at which antibody and antigen are at optimal concentrations so that they form a large insoluble lattice together is called the:

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Quizplus · Accepted Answer

The equivalence zone, also known as the zone of equivalence, is the point at which the concentrations of antibody and antigen are at their optimal ratio to form a large insoluble lattice, known as an immune complex. This results in the most efficient and effective binding of the antibody and antigen. The prozone and postzone are areas before and after the equivalence zone, respectively, in which the concentrations of antibody and antigen are too low or too high to efficiently form immune complexes.

The Zone at Which Antibody and Antigen Are at Optimal