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SERS analysis of PSN aggregation. (A) Calculated x-fold increase in SERS intensity following MDM2 addition to PSN-12.1 (red) and PSN-12.1WΔA (blue). (B) Peak height at 1416 cm−1 monitored every 60 seconds for 30 min following addition of varying amounts of MDM2 to PSN-12.1 (red) and PSN-12.1WΔA (blue). X-value represents the excess of MDM2 monomers per PSN. Dotted line indicates PSN samples when MDM2 is absent. Error bars illustrate the SD.
