Sites on cell membranes for affixing C3B, a derivative and active form of C3 or one of its decomposition molecules, C3BI or C3D. The receptors have three designations: CR1, CR2, and CR3, with CR1 holding utmost importance for phagocytes, B-Lymphocyes, granulocytes, and other mononuclear cells. This receptor aids in immune response and ingestion of complement-bound cells, and may modulate B-cell activation as well.

C3B RECEPTORS: "If the C3B receptors aren't functioning well, the disease may persist."

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