Proepicardial cells are attached to the dorsal pericardium by actin filopodia until release. Optical section of a 14 h in vivo time-lapse imaging of an epi:GFP;β-actin:LifeAct-RFP embryo starting at 52 hpf. GFP-labeled dorsal pericardium (DP) and proepicardial (PE) cells are shown in green. LifeAct-RFP marking F-actin is shown in red. Arrow in frame 75 points to an actin stalk connecting a PE cell with the DP. Scale bar: 50 μm. Shown is a representative movie from ≥ 3 biological and ≥ 2 technical replicates.