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The type 1 insulin-like growth factor receptor (IGF-IR) is emerging as a powerful survival factor against a variety of apoptotic agents in many cell types. A mutant IGF-IR designated 486/STOP is known to induce apoptosis and inhibit the growth of human tumor cells in mice. We have investigated the mechanism of action of 486/STOP. To study it, we have developed a new retroviral vector in which we have combined a self-inactivating 5'-long terminal repeat with an inducible heat-shock promoterpmid:11448933 fatcat:itna7zwknbgejcwkx4nuv3ymvq