To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 4 Young lGMR>GCaMP6m/+ adult retina at a proximal plane (Fig. 4), showing Ca2+ activities in cone cells. Calcium waves facilitate and coordinate the contraction of endfeet actin stress fibers in Drosophila interommatidial cells Donald F. Ready, and Henry C. Chang Development 2021. 148:None-None; doi: 10.1242/dev.199700 Download Original Video