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Fig. 6. Tbx20 regulates expression of a subset of BMP genes. Expression of Bmp4 (C,D) and Bmp7 (G,H) are not downregulated in Tbx20 mutants, whereas expression of Bmp2 (A,B) and Bmp5 (E,F) is severely downregulated specifically in the heart, as indicated by arrows. The left and right images in A and B show frontal and left views, respectively.