问题描述：
A biochemist wants to separate two peptides by ionexchange chromatography.At the pH of the mobile phase to be used on the column,one peptide (A) has a net charge of \53,due to the presence of more Glu and Asp residues than Arg,Lys,and His residues.Peptide B has a net charge of \31.Which peptide would elute first from a cation-exchange resin?Which would elute first from an anion-exchange resin?
问题解答：
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