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The classical pathway of complement and the Mannose binding lectin activation pathway converge at C4. C1s, MASP-1 and MASP-2 cleave C4 resulting in the formation of C4a and C4b. The latter can be cleaved to result in C4c and C4d in which step all functional sites are lost. The monoclonal antibody 16D2 reacts with intact C4, C4b and C4d. C4 is an acute phase protein that is produced by hepatocytes, monocytes and intestinal epithelial cells.