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Transmission x-ray microimages images showing the different internalization of AuNPs by different cell lines. A) An EMT cell co-cultured with 1 mM PEG‐coated AuNPs for 48 h. B) An EMT cell co-cultured with 500 μM naked AuNPs for 48 h. C) A HeLa cell co-cultured with 500 μM naked AuNPs for 48 h. D) A CT-26 cell co-cultured with 500 μM naked AuNPs for 48 h. (Bars: 5 μm).
