Use these Mini-PROTEAN TGX Stain-Free Protein Gels for separation of polypeptides >30 kD. Long-life TGX, Tris-Glycine eXtended, Stain-Free Gels have a novel formulation, which allows rapid fluorescent detection of proteins with Bio-Rad’s stain-free enabled imaging systems. TGX Stain-Free Gels can be used for both standard denaturing protein separations as well as native electrophoresis.