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Bright field optical microscopy images of human colorectal cancer cells (HCT-116) incubated with 39 mg/L polymer coated Cu2−xSe nanocrystals in PBS for 0.5 hr (A), 1 hr (B), 3 hr (C), and 6 hr (D). A control sample (E) was incubated for 6 hr and did not receive Cu2−xSe nanocrystals. Cells were incubated for the predetermined time and stained with Trypan blue to visualize cell death.
