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Bleomycin, and antitumor antibiotic: improved microbiological assay and tissue distribution studies in normal mice.

A microbiological assay was developed for bleomycin, an antitumor antibiotic reported to be active in human trials. The assay bacterium was a strain of Escherichia coli which is resistant to ethionine. Studies revealed relatively high concentrations of bleomycin in the blood and urine of mice after a single dose, < 0.33 ld(10), injected intraperitoneally.