Incomplete antibody

Incomplete antibody --> univalent antibody

An incomplete form of antibody that may coat antigen, but which according to the lattice theory does not have a second receptor for attachment to another molecule of antigen; in the case of Rh_ erythrocytes, such an anti-Rh antibody may coat the cells but not cause them to agglutinate in saline; however, agglutination does occur when such coated cells are suspended in serum or other protein media, such as albumin, therefore called serum agglutinin.

Synonym: incomplete antibody, inhibiting antibody.

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