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Flow cytometry analysis of U87MG cells after co-incubation with Ac-P/IR820 and Ac-PR/IR820 dendrimers for 3 h (a) and 6 h (b). U87MG cells pre-incubated with free RGD (2 μM) for 3 h and then co-incubated with Ac-PR/IR820 dendrimers for 3 h and 6 h were also tested for comparison (c) (* for p < 0.05, ** for p < 0.01, and *** for p < 0.001, respectively).
