To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3. A representative movie of GSK3β-phospho-active KHCS314D showing motility is stopped. A stop or go switch: glycogen synthase kinase 3β phosphorylation of the kinesin 1 motor domain at Ser314 halts motility without detaching from microtubules Rupkatha Banerjee, Piyali Chakraborty, Michael C. Yu, and Shermali Gunawardena Development 2021. 148:None-None; doi: 10.1242/dev.199866 Download Original Video