Protein abundance measured by western blotting. (a) Data are expressed as fold difference from the control group. Data are reported as mean ± SEM; error bars on the control group bar are the SEM of the group mean. AU, arbitrary units; VEGF, vascular endothelial growth factor. #P < 0.1. (b) Representative blots from one person per group. Control group, n = 13; NS group, n = 36, myalgic group, n = 19.