To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 Transheterozygous side mutant larva (sideC137/sideI1563) crawling on a 2% agarose substrate. Loss of substrate contact causes visible “arching” phenotypes. Sidestep-induced neuromuscular miswiring causes severe locomotion defects in Drosophila larvae Jaqueline C. Kinold, Carsten Pfarr, and Hermann Aberle Development 2018. 145:None-None; doi: 10.1242/dev.163279 Download Original Video