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Calculating the pI of AYDG

CHEM 4500 Video on how to calculate the isoelectric point (pI) of the tetrapeptide AYDG (Ala-Tyr-Asp-Gly) EDIT: the pI is actually 2.35/9.85= ~6.11 . It should be the average of the pKa's that is flanking the zwitterion.

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