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. 2017 Mar 9;7:131. doi: 10.1038/s41598-017-00278-6

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© The Author(s) 2017

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(a) Fluorescence excitation (black line) and emission (red line) spectra of Au₂₅P1₉. (b) HRTEM images of Au₂₅P1₉. Inset shows diameter distribution from statistic results of 100 particles. (c) MALDI-TOF MS spectra of Au₂₅P1₉. (d) GPx-1 activity suppressed by peptide-Au clusters in a dose dependent manner in buffer.