Junctional diversity
This process of V ( D ) J recombination has vital roles for the vertebrate immune system , as it is able to generate a huge repertoire of different T-cell receptor ( TCR ) and immunoglobulin molecules required for pathogen antigen recognition by T-cells and B cells , respectively . 
<triplet> immunoglobulin <subj> immune system <obj> part of <triplet> antigen <subj> immunoglobulin <obj> has effect