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Antibody blocking activity in an in vitro infection assay with sera raised against refolded and denatured OpaJ and meningococcal OMCs containing OpaJ. Two dilutions (1/100 and 1/1,000) of all sera were tested for blocking the binding between OpaJ and CEACAM1 (A), OpaB and CEACAM1 (B), and OpaB and CEA (C). The data shown represent the geometric means and standard errors of three independent experiments.
