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Schematic representation of the cytokeratin 18 (CK18) epitope map targeted by the antibodies used in the M30 and M65 sandwich ELISA assays. In the case of M65 ELISA the M6 antibody acts as the catcher and M5 as detection antibody. For the M30 ELISA assay M5 is the catcher and HRP conjugated M30 the detection antibody. Proposed caspase cleavage sites of CK18 are also indicated.
