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Blood vessel density in adult and aged soleus muscle. A and B: blood vessels were identified in cross sections of adult (A) and aged (B) soleus muscle based on platelet/endothelial cell adhesion molecule (PECAM) expression. C and D: quantification of the number of blood vessels normalized to the tissue area (C) or normalized to the number of muscle fibers (D). *Significant difference between adult and aged groups (P < 0.05). Scale bars = 100 µm.
