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400 ¦ÌL of cysteamine solution (213 mM) and 2.23 mL of HAuCl4 solution (25.4 mM) were mixed with 37.5 mL of H2O. After stirring for 20 min at room temperature, 10 ¦ÌL of NaBH4 solution (10 mM) was added, and the mixture was vigorously stirred for 30 min at room temperature in the dark.
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