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m2 vacA expression in HeLa cells transfected by pGEMp88J. (A) Phase–contrast microscopy. (B) Immunofluorescence microscopy with anti-VacA serum. (C) Neutral red uptake of HeLa cell transfected with pGEMp95 (CCUG 17874 VacA) or with pGEMp88J (95–54 VacA).
