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. 2015 Jun 4;15(6):13028–13051. doi: 10.3390/s150613028

Figure 4.

Figure 4

(A) Peptide sequence and sensor functional elements; (B) Chemical structure of the ligands on the QD surface; (C) Schematic illustration of the two-step assay for kallikrein proteolytic activity (Reprinted with permission from [77], Copyright 2014 American Chemical Society).