Fig. 3.

(A) Using picrosirius red staining, collagen density was increased more in abdominal aorta of old monkeys, compared with abdominal aorta in young monkeys or thoracic aortic collagen in either old or young monkeys. (B) Using aldehyde fuchsin staining, elastin density was less in both abdominal aorta compared with the thoracic aorta in both old and young monkeys and decreases were greater in both abdominal and thoracic aorta in old monkeys. (C) Collagen to elastin ratio was increased with aging in both thoracic and abdominal aorta, but increases were greater in the abdominal aorta. *p<0.05 by ANOVA.