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Collagen in left coronary arteries. Averages in individual TBI and nonirradiated mice are shown for the percentage of the arterial media (panel A) and peri-arterial space normalized to luminal perimeter (panel B) stained with PSR. A significant increase with time was observed in medial collagen of TBI but not in nonirradiated mice, and in peri-arterial collagen in both TBI and nonirradiated mice. Averages are from two arterial sections for each mouse. n = 4–7 per group.
