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Histological slices displaying a cross-section of the arterial wall from an ovine thoracic descending aorta (left) and an ovine carotid artery (right). The vessels were stained with orcein using the Cajal-Gallengo method, which allows discrimination of the tree main wall components that determine the arterial biomechanical behavior: smooth muscle cells (yellow), elastin (dark red), and collagen (blue).
