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Mechanism of action of different classes of mTOR inhibitors (rapalogs) already approved or under development.
Abbreviations: IRS-1, insulin receptor substrate 1; PI3K, phosphatidylinositol-3-kinase; AKT, protein kinase B; mTOR, mammalian target of rapamycin; PTEN, phosphatase and tensin homologue; S6K1, S6 kinase 1; 4E-BP1, eIF4E-binding protein 1.
