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Stability profiles of peptides with N-terminal CF labels in mouse serum (left) and comparison of stability between peptides with and without N-terminal labeling (right). Amounts of intact peptides were determined from the areas under the HPLC peak after incubation in serum at 37 °C for indicated time intervals. All tests were run in triplicate. Error bars represent standard deviation. **p < 0.05 (Student’s t test), and differences in all other pairs are insignificant (p > 0.05).
