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Phenotypic characterization of the grx mutants. The tolerance of WT Synechocystis sp. strain PCC 6803 and strains SGRXA, SGRXB, SGRXC, SGRXAB, SGRXAC, SGRXBC, and SGRXABC was tested. Tenfold serial dilutions were spotted onto low-phosphate BG11C plates supplemented with 100 mM sodium arsenate [As(V)], low-phosphate BG11C plates (− phosphate), or BG11C plates. Plates were photographed after 10 days of growth.
