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ChEBI: Actinomycin D is an actinomycin. It has a role as a mutagen.NCI Thesaurus (NCIt): Dactinomycin is a chromopeptide antineoplastic antibiotic isolated from the bacterium Streptomyces parvulus. Dactinomycin intercalates between adjacent guanine-cytosine base pairs, blocking the transcription of DNA by RNA polymerase; it also causes single-strand DNA breaks, possibly via a free-radical intermediate or an interaction with topoisomerase II. (NCI04)