Dr. Kim S. Tree was preparing a manuscript for publication in which she reported that the pi of the tripeptide Lys-Lys-Lys was 10.6. One of her students pointed out that there must be an error in her calculations because the pKa of the s-amino group of lysine is 10.8 and the pi of the tripeptide has to be greater than any of its individual pK.A values. Was the student correct?
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