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Effect of FeSO4 (1 mM) supplementation on the biosynthesis of heme (A), vitamin B12 (B), and accumulation of organic acids (C) when grown under microaerobic and anaerobic conditions in yeast extract–lactate medium supplemented with CoCl2 (5 mg/L). The values are means and standard deviations of three biological replicates. A significant difference between the treatments (P < 0.05) is indicated by an asterisk.
