bmp10 and bmp10-like are expressed in the heart. (A) Whole-mount in situ hybridization for bmp10, bmp10-like and myl7 at 28, 36 and 48 hpf. Ventral views, anterior upwards. Scale bar: 50 μm. V, ventricle; A, atrium. Asterisk indicates atrioventricular canal. (B) Sagittal sections (8 μm) through the heart of 36 hpf embryos co-stained with bmp10, bmp10-like or myl7 (purple) and MF20 (sarcomeric myosin; brown). Scale bar: 10 μm.