To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 4. A representative movie showing the larval crawling behavior in a WT larva (left), and defective larval crawling behavior in the crisper-cas9 khcS314-/- homozygous mutant larva (right). 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