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LacZ staining of Rosa26RNkx2.1-cre (A and B) E9 embryos, and thyroids at (C and D) E13.5 and (E and F) PN15, showing cre specific activity in the epithelial cells in the thyroid. (D) As expected, the cells in the parathyroids are negative for LacZ staining. Br, brain; T, thyroid; Pth, parathyroids; EC, epithelial cells; Col, colloids.
