Word: cytotoxin
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...first antibiotic ever isolated by Nobel Prizewinner Selman Waksman was actinomycin. And just as Dr. Waksman hoped, the drug made strong medicine. It killed many man-killing microbes; unfortunately, it acted like a mankiller as well. It turned out to be a cytotoxin, a cell poison with the strange selective trick of attacking some cells more than others. So virulent that one milligram could kill a large chicken, actinomycin seemed far too dangerous ever to try on humans. Last week in Rome, pleasantly surprised, Dr. Waksman told the International Congress of Microbiology that German scientists have finally taken the sting...
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