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(a) 1/5/10 µM DNA probe immobilized sensor chips calibration curve showing current gain versus miRNA concentration (miRNA concentration 0/10/25/50/100/250/500/1000 fM). (b) Testing miRNA (0/10/25/50/100/250/500/1000 fM) in 1× PBS on bare gold surface of sensor (non-functionalized sensor).
