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ELISA based on HPV16 L1, L2, E4, E6 and E7 coating antigens. Detection of specific immunoglobulins to the HPV16 proteins in sera of women infected by HPV 16 (empty dots) or by other HPVs (black dots). The protein used as coating antigen is indicated on each panel. In abscissa is reported the number of each serum as listed in Tab.2; in ordinate is reported the optical density of each reaction.
