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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Fluorescence microscopy images of U87 cells after incubating with PEGNIO/QDs/MIONs ((A): without MT; (B): with MT) and PEGNIO/QDs/MIONs/Tf ((C): without MT; (D): with MT). The quantification procedure was evaluated with p < 0.05, and is therefore significant.