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(A) Vacuolating activity of purified 95–54 VacA or purified CCUG 17874 cytotoxin on RK-13 cells or on HeLa cells (B) as determined by the neutral red uptake assay. (C) Phase–contrast microscopy of primary cultured human gastric cells vacuolated by 40 μg/ml 95–54 cytotoxin.
