Chickens produce a diverse repertoire of antibodies by gene conversion. In every B cell, the single functional V region at the heavy and light chain immunoglobulin loci is continually altered (i.e. converted) by the donation of sequences from an upstream array of pseudogenes. The continued iterations of gene conversion throughout the life of the bird produce a virtually unlimited antibody repertoire of starting antibodies that can be further improved through antigen-driven selection and affinity maturation, resulting in B cells producing monoclonal antibodies with high affinity and high specificity to a chosen target. The animation is a representation of how the gene conversion process generates diversity.