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Content of collagen per carotid segment (A) and elastin per carotid segment (B) in the injured carotid arteries of control rats (filled bars) and doxycycline-treated rats (open bars) at 7 and 21 days after injury. Values are mean ± SEM; the number of rats in each group is indicated at the bottom of the bar. *, Collagen or elastin content measured at 21 days is significantly greater than content measured at 7 days.
