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Summary: The luminous intensity of dark variant (S1) separated from photobacterium phosphoreum (A2) was 1/10 000 less than that of wild-type. Ethidium bromide (EB) (0.6 mg/L), Mytomycin C (MC, 0. 05 mg/L), 2-amino fluorene (2-AF, 1.0 mg/L) all could stron