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Transgenic mouse tissues showing expression of collagen type I (blue staining of Lacz reporter gene) in different types of blood vessels. (a) Cross section of lower limb in blood vessels of a newborn mouse. (b) Collagen type I expression in the wall and value of the aorta during mouse embryonic development (E15.5). (c) Collagen type I expression in intercostals arteries and ribs during mouse embryonic development (E15.5).
