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Complement receptors and their main ligands. Schematic representation of human complement receptors on the plasma membrane with their corresponding complement protein ligands. For CR1, CR2, CRIg, and CR3/4, the binding areas for each specific ligand are indicated. In addition, for CR1, the receptor domains are identified at the left side of the receptor. CCP, complement control protein repeats; LHR, long homologous repeats; MBL, mannose-binding lectin.
