T CHAIN
\tˈiː t͡ʃˈe͡ɪn], \tˈiː tʃˈeɪn], \t_ˈiː tʃ_ˈeɪ_n]\
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A glycoprotein found in a variety of external secretions (tears, bile, colostrum) usually complexed to secreted polymeric immunoglobulins (IMMUNOGLOBULIN A or, less frequently IMMUNOGLOBULIN M). It is derived, by proteolytic cleavage, from the polymeric immunoglobulin receptor (RECEPTORS, POLYMERIC IMMUNOGLOBULIN) and probably functions to protect the immunoglobulins from proteolysis in the secretions. (From Rosen et al., The Dictionary of Immunology, 1989)
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Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.