CLEC4C and temporal arteritis: Supplementary Table S4 also shows patient characteristics of aorta tissue IHC LV-GCA patients. MxA was expressed in 8/8 GCA+ patients and in 13/14 GCA- patients with atherosclerosis. In TABs and aorta tissue, MxA was expressed in all vessel layers varying between patients (Figure 2). As pDCs are the main producers of IFN-I, CD303 expression was assessed in TABs of GCA+ and GCA- patients. No pDCs were detected in both GCA+ and GCA- TABs, suggesting an alternative cellular source for IFN-I production (Supplementary Figure S2).