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. 2017 Mar 25;17(4):681. doi: 10.3390/s17040681

Figure 4.

Figure 4

Proposed mechanism of Apt-AuNPs’ response to serotonin. (A) Schematic representation of the proposed mechanism, in which target binding results in an aptamer conformation that improves Apt-AuNPs’ stability against salt-induced aggregation. (B) Assay color change in response to serotonin and its metabolite 5-HIAA.