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Fig. 7. Tbx20 and Nkx2-5 independently regulate common downstream targets. (A-D) Expression of Hand1 and Irx4 is downregulated in Tbx20 mutants. (E,F) Hand2 and (G-J) Nkx2-5 expression are unaffected in Tbx20 mutants. Images in A,B show left side views and images in C-J show frontal views. Arrows indicate the corresponding heart regions in wild type and mutant embryos.