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a) Draw the tetrapeptide Cys-Pro-Leu-Asp at pH=1 b) Assuming pka of the side chain of cysteine...

a) Draw the tetrapeptide Cys-Pro-Leu-Asp at pH=1

b) Assuming pka of the side chain of cysteine is 8.5, what is the pI of this tetrapeptide?

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