Abstract
A novel family of antitumor antibiotics, the calicheamicins, were isolated from the fermentation broth of Micromonospora echinospora subsp. calichensis. These antibiotics exhibited significant activity against Gram-positive and Gram-negative bacteria in vitro. Calicheamicin gamma 1I demonstrated antitumor activity against P388 leukemia and B16 melanoma in vivo.
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