CHRM3 and myalgic encephalomeyelitis/chronic fatigue syndrome: The median concentration of anti-muscarinic cholinergic receptor 3 (anti-M3) antibodies in ME/CFS patients’ plasma samples was 6.75 ng/ml, while in healthy donors, it was 2.29 ng/ml, without a significant difference between cases of ME/CFS and healthy controls (Figure 2A), as well as between female and male patients (Figure 2B), and without significant differences regarding disease severity (Figure 2C).