To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. 180-degree rotated rendered 3D images revealed nuclei hidden behind large neurons on the dorsal side of the ganglion. Transgenesis enables mapping of segmental ganglia in the leech Helobdella austinensis Dian-Han Kuo, Lidia Szczupak, David A. Weisblat, Enrique L. Portiansky, Christopher J. Winchell, Jun-Ru Lee, and Fu-Yu Tsai Journal of Experimental Biology 2024. 227:None-None; doi: 10.1242/jeb.247419 Download Original Video