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Ultrasmall GNs in cancer PDT. The left part shows a schematic representation of the GN-based PDT drug delivery system, which has greatly increased water solubility and reduced drug delivery time. PEGylated GNs are conjugated to the hydrophobic PDT drug Pc 4. The right part shows the structure of Pc 4. Adapted with permission from 78, copyright 2008 American Chemical Society.
