To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 Htl regulates LO1 myotube guidance. Stage 12 slou>eGFP,nRFP embryos were live imaged at 5 min intervals to visualize LO1 muscle development. LO1 muscles in htl embryos occasionally fail to turn toward the anterior. 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