Abstract

C1q is the recognition unit of the first component of complement that binds not only IgG and IgM containing immune complexes, but also recognizes foreign structures such as the lipid A of endotoxin, and molecules expressed at the surface of apoptotic cells. In this review, the plasma membrane receptors and binding proteins for C1q are discussed and new data are presented on calreticulin expression on human peripheral blood cells. Although much is known about C1q receptors and binding molecules there are still many questions regarding their role in vivo.

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