Isoelectric focusing in ultrathin polyacrylamide gels.
Isoelectric focusing is an electrophoretic method for the separation of amphoteric macromolecules according to their isoelectric points (pI) in a stabilized natural pH gradient. It is a sensitive and reproducible technique, particularly valuable in the separation of closely related proteins that may not be easily separated by other techniques.
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Metropolitan Police Forensic Science Laboratory, London, England.