What are the differences between bis-tris and tris-glycine gels in terms of their composition and performance in protein electrophoresis?

Bis-Tris gels and Tris-Glycine gels differ in their composition and performance in protein electrophoresis. Bis-Tris gels use bis-Tris buffer and have a more stable pH range, resulting in sharper protein bands. Tris-Glycine gels use Tris-Glycine buffer and are more commonly used for separating smaller proteins. Overall, the choice between the two gels depends on the specific needs of the experiment and the proteins being analyzed.