Abstract
AbstractOne‐dimensional sodium dodecyl sulphate‐polyacrylamide gel electrophoresis (SDS‐PAGE) of protein in the presence of Nonidet P–40 (NP–40) induces vertical streaking which breaks horizontal bands of protein to produce a “multiple spot” effect. The same effect can be induced upon high resolution two‐dimensional electrophoresis if the NP–40 concentration of the first‐dimension isoelectric focusing (IEF) gels is increased to 4 % w/v and the gels electrophoresed (SDS‐PAGE) without SDS‐equilibration. The relevance of this phenomenon as regards interpretation of two‐dimensional electrophoretic patterns is discussed.
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