According to the clonal selection theory,

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According to the clonal selection theory, an individual animal contains many different types of B cells, each producing one specific kind of antibody. When an individual is exposed to an antigen, only the B cells that produce antibodies that specifically recognize that antigen will be stimulated to divide and produce clones of themselves, leading to a selective amplification of the B cells that produce the most effective antibodies against the antigen. This process is what accounts for the specificity and diversity of the immune response to different antigens.

According to the Clonal Selection Theory