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Nickel content of wild-type H. pylori strain 26695 and of the isogenic mutants hspA-ΔC, hspA-NB, and hspA-CC without nickel (black bars) or with increasing NiCl2 concentrations, 1 μM (gray bars) and 10 μM (white bars). The nickel content was measured in cell lysates using ICP-MS and is expressed in μg of nickel per g of proteins. Measurements were performed in triplicate.
