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AFM images: (a) Aβ (1–42) in PBS buffer (pH 7.4), 8 μm × 8 μm; (b) DHLA-capped QDs, 1 μm × 1 μm; (c) Aβ (1–42) mixed with DHLA-capped QDs in PBS buffer (pH 7.4), 4 μm × 4 μm; (d) Aβ (1–42) conjugated to DHLA-capped QDs in PBS buffer (pH 7.4), 4 μm × 4 μm.
