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Protection of protein-encapsulated in OCs by PE2 coating. (A) Schematic view showing that OC/PE2 system reduces trypsin digestion of fluorescein-labeled BSA encapsulated in the OCs. Adapted with permission from PDB ID: 1S0Q (69). (B) Fluorescence kinetics shows enhanced fluorescence of the fluorescein-labeled BSA upon trypsin cleavage (λex, 490 nm; λem, 525 nm, 37 °C).
