SLC6A4 and myalgic encephalomeyelitis/chronic fatigue syndrome: The range of fold change from baseline for the CFS group was 0.70 (SLC6A4 at post-4 h) to 2.39 (adrenergic β-1 at post-24 h); and for the CON group, 0.55 (IL-10 at post-72 h) to 2.08 (adrenergic β-1 at post-72 h).