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Nigrin b is a non-toxic type 2 ribosome-inactivating protein as active as ricin at ribosomal level but 10 5 and 5 × 10 3 times less toxic for animal cell cultures and mice, respectively, than ricin. The purpose of the present study was to analyze the effects of intravenous injection of large amounts of nigrin b to the mouse. Injection through the tail vein of 16 mg/kg body weight killed...
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