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Schematic views of the five protein structures. A–D, the arrangement of the 10–13 domains of C3, C3u, C3b, and C3c depicted as schematics with the TED (red circle or hexagon), CUB (blue rectangle), and ANA (dark triangle) domains shown when present. The eight MG domains and one C345C domain are shown in yellow. E, summary of the relationship between the five forms of C3.
