A) Flow cytometric analysis monitoring the binding of FITC-sgc8-mGO (10, 100, 200 ng/mL) to CCRF-CEM cells (target cells) at 37°C after 2 h incubation. Cell viability test. B) Under nonilluminated condition and B) under illuminated condition with 808 nm NIR laser. Only cells (a), mGO (b), free ICG (c), ICG@mGO (d), Sgc8@mGO (e), Sgc8@ICG@mGO (f) and rDNA@ICG@mGO (g).