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a) Antibacterial activity of cadaside is dependent on calcium. b) Effect of 100 mM calcium on the potency of diverse antibiotics. Concentrations are reported in μg/mL, whereby 1 μg/mL is equal to 0.64 μM for cadasides A and B. c) Ability of different cations to induce cadaside antibiosis. d) pH dependence of cadaside antibiosis. e) Cadaside A spectrum of activity.
