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" ... Camelid-derived antibodies lack a light chain and are composed of two identical heavy chains. These unique heavy-chain antibodies are also known as nanobodies. Camelid nanobodies are less than a quarter of the size of human antibodies. They are more stable, more simply modified, and less expensive than traditional monoclonal antibody drugs. These unique qualities have prompted researchers to develop camelid-derived nanobody drugs for Covid-19. ... "