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Shotgun proteomics of complex samples is generally coupled with at least one peptide fractionation step and, to this effect, peptide isoelectric focusing (IEF) in immobilized pH gradient (IPG) is one of the most used techniques. Fractionation with the OFFGEL 3100 Agilent Technologies apparatus allows the easy recovery of peptides that, after focusing, diffuse into the liquid phase above the gel strip...
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