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Top-schematic of 100-nm gelatin-QD changing size to 10 nm QD NPs in response to MMP-2. Bottom- in vivo images of gelatin-QD NPs (a) 1h, (b) 3 h, and (c) 6 h after intratumoral injection into the HT-1080 tumor. Reproduced with permission from Ref [85]. Copyright 2011 National Academy of Sciences.
