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. 2015 Apr 7;10(4):e0123325. doi: 10.1371/journal.pone.0123325

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Fig 3 — LacZ activity was assayed at E15.5, following tamoxifen treatment at time indicated above each panel. All insets to the right show forelimb (FL) and hindlimb (HL) buds oriented with distal at top, and anterior-to-posterior (digit 1–5) from left-to-right. Note that no LacZ staining is evident in tissues outside of the limb.