Cardiac BMP4 expression pattern in shh and XBMPtR injected embryos. (A) BMP4 expression is more symmetric in the heart tube after injection of shh mRNA at the 1- to 2-cell stage. (B) Injection of the truncated BMP4 receptor, XBMP4tR mRNA, which interferes with jogging and looping, has no effect on cardiac BMP4 expression pattern. Dorsal-lateral views, anterior to the left.
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