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Hematoxylin and eosin–stained sections of teratomas formed following transplantation of hESC into NOD/SCID mice. hESC lines (A) H1 and (B) H9. Tissue features marked: M, muscle; N, neuroectoderm; I, intestinal epithelia; C, cartilage. Scale bars = 100 μm (magnification × 100). hESC, human embryonic stem cells.
