Fig. 5

Fig. 5 Mutants with reduced cardiac jelly. (A) Image of the heart of a live 2-day old sco^te382 embryo. Only the myocardial layer is visible in the atrium but not the endocardial layer. The low circulation results in a lack of blood cells in the heart. (B) A sagittal section of the heart of a 2- day old sco^te382 embryo. Both, the myocardium (arrow) and endocardium (arrowhead) are present in the heart. However, the matrix between the two cell layers is very thin. The endocardium seems to attach to the myocardium, especially in the atrium. Valves (v) are formed and placed at the atrial-ventricular junction. In addition, the endothelial cells in the ventral fin of 2-day old sco^te382 embryos (D) are not as organized as in the wild type siblings (C), and blood cells accumulate in the empty space in the ventral tail fin. Scale bar, (A,C and D) 100 μm; (B) 50 μm.