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actinomycin(n) any of various red antibiotics isolated from soil bacteria
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actinomycin<drug> <pharmacology> A group of peptide antibiotic agents, isolated from several species of Streptomyces (originally Actinomyces), that are active against Gram-positive bacteria, fungi, and neoplasms. Actinomycins are chromopeptides, most containing the chromophore actinocin, and are derivatives of phenoxazine that differ in their amin [..]
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