polyacrylamide gels further containing a hydrophilic polymer

The invention concerns a novel composition for preparing a polyacryamide gel characterised in that it comprises a hydrophilic polymer which is not in the form of a dispersoid, methods for preparing polyacrylamide gels from said compositions and the use of said gels for separating nucleic acids by electrophoresis, in particular for sequencing and/or detecting nucleic acid mutation, separating proteins and optionally protein-nucleic acid complexes.