In a study conducted in vitro, Yun et al. [53] focused on butyrate’s action, demonstrating that this metabolite suppresses inflammatory cytokine production (IL-6, TNF-α, and IL-1β) in peripheral blood mononuclear cells (PBMCs) isolated from patients with mucocutaneous involvement of BD and healthy controls. The gene discussed is TNF; the disease is Behcet disease.