(C) Top panel: growth curves of wild-type (BTM843), yqgP deficient (BTM844) and rescue (BTM845) strains of B. subtilis in M9 minimal medium with limiting magnesium (0.01 mM MgSO4), exposed to manganese shock elicited by adding 75 µM MnSO4 in mid-exponential phase. Bottom panel: manganese toxicity is prevented by further adding 5 mM magnesium (MgSO4) in otherwise identical conditions. 