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(a) Molecular structures of the precursors and the hydrogelators containing different fluorophores. (b) Illustration of the distinct spatial distribution of the small molecules in a cellular environment. Fluorescent confocal images of the HeLa cells incubated with 500 µM of (c) 6a, (d) 7a, (e) 8a, and (f) 9a for 30 min.[52] (Print with the permission from © 2013 American Chemical Society)
