CD8A and myeloid sarcoma: Among the untreated MS patients, only two SCFA were involved in the main correlations: PA and AA, with TNF-α-producing B cells (r = −0.592 and r = −0.558, respectively) and with IL-17-producing CD8+ T cells (r = 0.549 and r = 0.584, respectively), showing the importance of the metabolites from gut microbiota in the disease.