Are of the peptides' termini modified in any way?

The peptides used in the Kinase Substrate Sets are N-terminally biotinylated and C-terminally amidated. The peptides used in the Phosphatase Substrate Sets are N-terminally free and C-terminally amidated. The peptides used in the Protease Substrate Sets carry Fluorophore and Quencher on N- and C-terminal ends respectively.

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