CXCL1 and myalgic encephalomeyelitis/chronic fatigue syndrome: In addition, CCL11 (Eotaxin-1), chemokine (C-X-C motif) ligand 1 (CXCL1), CXCL10 (IP-10), IFN-γ, IL-4, IL-5, IL-7, IL-12p70, IL-13, IL-17F, leptin, granulocyte colony-stimulating factor (G-CSF), granulocyte-macrophage colony-stimulating factor (GM-CSF), LIF, nerve growth factor (NGF), stem cell factor (SCF), TGF-β and TGF-α [153] correlate with ME/CFS severity.