Abstract
B cells rely on a broad receptor repertoire to provide protection against a wide range of pathogens. This is in part achieved through V(D)J recombination, which, by assembling various combinations of variable (V), diversity (D), and joining (J) genes, creates different IgV regions.1 The recombination processes is initiated by recombination-activating gene (RAG) 1/RAG2 enzymes and requires a functional nonhomologous end-joining (NHEJ) machinery. B cells can further diversify their IgV regions through somatic hypermutation (SHM) to improve affinity between the antibody and antigen and switch the isotype of antibody produced by class-switch recombination (CSR).
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