Confocal microscopic analysis of Glut4 induction. C2C12 cells were treated with DMSO (control), 5 and 10 μM DIM-C-pPhOH-3-Cl-5-OCH3, or 1 mM metformin for 24 hours. Cells were then fixed, immunostained with β-actin, Glut4 antibodies, and DAPI, merged, and analyzed by confocal microscopy.