CXCL9 and inclusion body myositis: On the other hand, CD1C was differentially correlated with CD4, several IFN-II pathway genes (e.g., CCR5, CXCL9, CXCR3, IFI30), ten MHC-II-encoding HLA genes, as well as KLRB1 and KLRG1 in IBM samples.