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Effects of orexin A and orexin B on proliferation of rat C6 glioma cells. The cells were incubated with peptides (0.001–1 μM) for 24 h. Proliferative activity of the cells was assessed by [methyl-3H]thymidine incorporation assay. The results are expressed as a percent of the mean control value (3,463 cpm) and represent means ± SEM of five to six values per group
