Thapsigargin blocks muscle contractions Single plane spinning disc confocal movies of myotubes labelled with Mef2-Gal4, UAS-Lifeact-Ruby and Mhc-GFP (not shown), either injected with DMSO (left movie) or with Thapsigargin (right movie) at 52 h - 53 h APF and imaged at 55 h APF. Time is indicated in seconds. Movies plays with 10 frames per second.