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A capillary zone electrophoresis (CZE) method to separate the peptide series val-gly n , where n is 1 to 4, has been evaluated and compared to separation by reversed-phase high-performance liquid chromatography (RP-HPLC). The method was able to quantitate peptides present at very low concentrations (down to 0.05 mM) with high reproducibility and accuracy and was capable of separating peptides...