<p>Confocal micrographs collected from a ventral point of view show a progressive increase in vessel complexity (red, A, C, E, G) and in density of mural cell coverage of aortic arch vessels (green, B, D, F, H) from 4 dpf (A, B), 7 dpf (C, D), 11 dpf (E, F) through 14 dpf (G, H). Heart expression of acta2:EGFP is maintained. aaa = aortic arch arteries; va = ventral aorta; ba = bulbus arteriosus. Scale bar in A represents 100 µm.</p
