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The HER2-specific targeting rate of IR783-NBs-Affibody towards HER2 (+) breast cancer cells BT-474/T-47D and HER2 (−) breast cells MDA-MB-231. The B1 area represents cells dyed with IR783, B2 for cells dyed with both IR783 and DiO, B3 for cells without fluorescence, and B4 for cells dyed with DiO.
