A mixture of four peptides, PKKRK, RGERV, LVVYP, and FFVVF, is loaded onto a DEAE (Diethylaminoethyl) cellulose column at pH = 7.0. DEAE is an anion-exchange resin. Which peptide elutes first?

1
PKKRK
2
RGERV
3
LVVYP
4
FFVVF 

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