(cat#9351s), STAT5 (cat#9363s), p-AKT (cat#4060s), AKT (cat#2920s), BCL-XL
(cat#2764s), p-ERK (cat#4370s), 4EBP1 (cat#9644), and p-4EBP1 (cat#2855) were
purchased from Cell Signaling Technology (Danvers, MA). Antibodies against MCL-1
(cat#sc-819) and BCL-2 (cat#M0887) were purchased from Santa Cruz Biotechnology
(Santa Cruz, CA) and DAKO (Carpentaria, CA), respectively. β-actin or
α-tubulin was used as a loading control. Signals were detected using the
Odyssey Infrared Imaging System (LI-COR Biosciences, Lincoln, NE) and quantified
using Odyssey software (version 3.0, LI-COR Biosciences).