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These were characterized by 11B NMR, attenuated total reflection Fourier transform infrared spectroscopy, circular dichroism, scanning electron microscopy and transmission electron microscopy. Microscopy investigations revealed the transformation of an extended fiber assembly into discrete flakes after incorporation of Pt-DA. Pt-DA showed photocytotoxicity against cisplatin-resistant A2780Cis human ovarian cancer cells (IC50 74 \u03bcM, blue light) with a photocytotoxic index &amp;lt;2, whereas Pt-G4K+B hydrogels exhibited more potent photocytotoxicity (IC50 3 \u03bcM, blue light) with a photocytotoxic index &amp;gt;5. 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