Specifically, Dbh+ CFS mice had increased AEP relative to the other three groups: rested Dbh+ mice (q = 4.7; p < 0.05), Dbh− CFS mice (q = 6.2; p < 0.001), and rested Dbh− mice (q = 5.8; p < 0.01). This evidence concerns the gene DBH and myalgic encephalomeyelitis/chronic fatigue syndrome.