Effects of salubrinal on colony-forming unit-macrophage/ monocyte (CFU -M). Approximately 2.5x104 bone marrow mononuclear cells were prepared and seeded onto a 35-mm gridded dish supplemented with 30 ng/ml M-CSF and 20 ng/ml RANKL. Three dosages of salubrinal (1, 2, and 5 μM) were administered and cells were cultured for 7 days. A: Salubrinal-induced reduction in CFU-M numbers in the RANKL-injected mice using three dosage of salubrinal. The images exhibit the 4 different CFU-M cultures, in which the circles indicate the colonies. B: Comparison of CFU-M numbers in the vehicle control and RANKL-injected mice with and without in vitro administration of salubrinal. The representative microphotographs are shown, displaying 4 CFU-M cultures with colonies in circle. Bar = 500 μm.