Asaumi, Y. et al. identified the CXCL13/CXCR5 axis as a contributor to myocarditis pathogenesis [35], while Krueger, G.R. et al. revealed that the CXCL4/CXCR3 axis regulates cardiac fibrosis via TGF-β1/Smad2/3 signaling in viral myocarditis [36]. The gene discussed is PF4; the disease is myocarditis.