\sˈɛkɹɪtəɹˌi kəmpˈə͡ʊnənt], \sˈɛkɹɪtəɹˌi kəmpˈəʊnənt], \s_ˈɛ_k_ɹ_ɪ_t_ə_ɹ_ˌi k_ə_m_p_ˈəʊ_n_ə_n_t]\
Definitions of SECRETORY COMPONENT
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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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- A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and trapdoor spiders. See Mygale.