Induction of the C/EBP Homologous Protein (CHOP) by Amino Acid Deprivation Requires Insulin-Like Growth Factor I, Phosphatidylinositol 3-Kinase, and Mammalian Target of Rapamycin Signaling**This work was supported by NIH Grants CA-42572 and CA-85492. Sequencing was carried out by the DNA Sequencing Shared Resource (Grant P30-CA-68485). Data presentation was performed in part through the use of the Vanderbilt University Medical Center Cell Imaging Resource (Grants CA-68485 and DK-20593).