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Fig. 2. The targeted tTA transactivator is expressed in an equivalent spatial
pattern to endogenous Hand1. Whole-mount RNA in situ
hybridisation analysis of Hand1 (A) and tTA (B) in
control embryos at E9.5. (C,D) Frontal sections through the
distal OFT region. (E-H) Sagittal sections through the first branchial
arch (E,F) and heart (G.H). as, aortic sac; ba, branchial arch; oft, outflow
tract; lv, left ventricle. Scale bars: in B, 200 µm for A,B; in H, 50 µm
for C-H.