To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Htl regulates VL1 myotube guidance. Stage 12 5053>eGFP,nRFP embryos were live imaged at 5 min intervals to visualize VL1 muscle development. Rounded VL1 muscles in htl embryos often failed to elongate across the segment. FGF signaling directs myotube guidance by regulating Rac activity Shuo Yang, Allison Weske, Yingqiu Du, Juliana M. Valera, Kenneth L. Jones, and Aaron N. Johnson Development 2020. 147:None-None; doi: 10.1242/dev.183624 Download Original Video