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Representative photomicrographs showing immunostaining for α-actin (smooth muscle cells) (dark blue in a, b) and staining using Sirius red (collagen) (red in c, d) in transversal sections from the aortic sinus of CCR1+/+ (a, c) and CCR1−/− (b, d) mice. We found a 76% decrease in smooth muscle cell accumulation and a 30% decrease in collagen content in lesions of CCR1−/− mice. Original magnifications × 200.
