Myosin accumulates in proepicardial cells. In vivo time-lapse imaging of epi:GFP;myl12.1:mCherry 52-hpf embryo during 7 h. Optical section zoomed view of the proepicardial (PE) region. GFP labels dorsal pericardial (DP) cells (green). myosin12.1-mCherry is shown in red. Note the presence of myosin-positive PE cells and PE cells that are advected in the pericardial cavity. Scale bar: 50 μm. Shown is a representative movie from ≥ 3 biological and ≥ 2 technical replicates.