title: Instability of pH gradients in isoelectric focusing on polyacrylamide gel.
mesh_terms: D002021:Buffers; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D007525:Isoelectric Focusing; D010179:Pancreas / Q000032:analysis; D011506:Proteins / Q000032:analysis; D013194:Staining and Labeling; D013997:Time Factors
chemical_list: D002021:Buffers; D011506:Proteins