Hello! I want to run an SDS-PAGE with a protein of ~ 15 kDa. Is it OK to use Tris-Glycine-SDS with a precast TGX gel (for example, 4-15%), given that the migration chart of a pre-cast gel shows that it's possible to identify bands of 15 kDa (and that TGX stands for Tris-Glycine eXtended)? Is it better to use a Tris-Tricine-SDS running buffer (as it is supposed to be more suitable for smaller proteins)?