protein kinase inhibitor mTOR inhibitor CHEBI:68481 mammalian target of rapamycin inhibitors mTOR inhibitors chebi_ontology mammalian target of rapamycin inhibitor A protein kinase inhibitor of the <em>m</em>ammalian <em>t</em>arget <em>o</em>f <em>r</em>apamycin (mTOR), a protein that regulates cell growth, cell proliferation, cell motility, cell survival, protein synthesis and transcription. mTOR inhibitors are used to prevent transplant rejection and in treatment of cancer.