Gene reassortment confers immunoglobulin diversity. Functional diversity occurs by use of distinct heavy chains. Identification of a previously unknown immunoglobulin gene in zebrafish suggests such functional specialization also occurs in this species and probably in all bony fish.
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Flajnik, M. The last flag unfurled? A new immunoglobulin isotype in fish expressed in early development. Nat Immunol 6, 229–230 (2005). https://doi.org/10.1038/ni0305-229
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DOI: https://doi.org/10.1038/ni0305-229
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