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A chimeric toxin in which the cell binding domain of Pseudomonas exotoxin was replaced with mature human insulin-like growth factor I (IGF-I) was produced in Escherichia coli. This protein, IGF-I-PE40, was cytotoxic to human cell lines derived from a variety of tumor types, with a breast carcinoma line (MCF-7) and two hepatoma lines (HEP3B and HEPG2) showing the highest sensitivity to the toxin. The specificity of IGF-I-PE40 cytotoxicity was confirmed through competition with excess IGF-I andpmid:1846308 fatcat:5g567edbdvbelc2qz77tec6vry