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Occurring naturally in 'heavy chain' immunoglobulins from camels, and now produced in fully human form, domain antibodies (dAbs) are the smallest known antigen-binding fragments of antibodies, ranging from 11 kDa to 15 kDa. dAbs are the robust variable regions of the heavy and light chains of immunoglobulins (V H and V L respectively). They are highly expressed in microbial cell culture,...