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(a) Old C57BL mice display marked decreases in vessel number and size. Old C57 striae appear significantly more disorganized than young C57 animals. (b) Vascularity decreased significantly with age in C57 animals (4.9% ± 0.02% versus 3.9% ± 0.02%, P < 0.05). There was no difference in vascularity with age in young versus old SW animals (9.7% ± 0.02% versus 10.5% ± 0.02%).
