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Host-derived myogenic cells are present in fetal limbs transplanted under the skin of newborn MLC3F-nLacZ transgenic mice and vascularized by the host. A, Whole-mount stain reveals a cluster of β-gal+ nuclei in the transplanted limb. B–D, Cross-section of the same sample stained for β-galactosidase activity revealed the β-gal+ nuclei (B) inside myosin positive muscle fibers (D) adjacent to VE-cadherin positive vessels (C). Bar, 25 μm.
