Antigen binding site on antibody is -

The antigen combining site of the immunoglobulin molecule is at its amino terminus. - it is composed of both L and H chains. - the first 110 amino acid from the N terminal is quite variable in amino acid sequence and this region is called the variable region: Variable light chain and variable heavy chain. Reference: Anathanarayan & paniker&;s 9th edition, pg no: 94 <\p>