SOLVED: You need to prepare running buffer for SDS-PAGE. The protocol suggests to prepare 1x Running Buffer from 10x SDS-Glycine, 2M Tris, 2M Glycine, and 0.25M Tris HCl. You will need to
BioRad 10x Tris/Glycine/SDS Buffer 5 L | Flinn Scientific
Tris-Acetate-SDS Running Buffer [20X] - Cepham Life Sciences Research Products