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Immunohistochemical (IHC) staining of umbilical cord tissues. IHC staining for DSPP (a, e), DMP1 (b, f), CALB1 (c, g), and CD146 (d, h). CD146 is expressed on arteries of the umbilical cord, suggesting that the majority of stem cells arise from the microvasculature. (scale bars: (a)–(d) 4 mm, (e)–(h) 200 μm).
