MRC1 and temporal arteritis: A recent study investigated the special distribution of different macrophage phenotypes in GCA arteries and showed that CD206+MMP-9+ macrophages are located at the site of tissue destruction, whereas FRβ+ macrophages are located in the inner intima of arteries with degrees of intimal hyperplasia, and that this pattern was specific to GCA lesions and not seen in atherosclerotic lesions.