CXCL9 and coronary artery disorder: Single-cell analysis of human CXCL9 mRNA and HDV RNA performed via RNA ISH in liver biopsies from patients with CHD revealed co-expression of HDV and CXCL9 RNA in HBV/HDV-coinfected human liver biopsies (Fig. 1C), thus identifying hepatocytes as producers of these chemokines in human livers.