Fig. 6From: Recent advances of fluorescent biosensors based on cyclic signal amplification technology in biomedical detectionA Schematic diagram of sensitive detection of VEGF mRNA and live cell imaging based on DSN-assisted cycling [68]. B Schematic diagram of G-quadruple probe based on 2-aminopurine binding SDR for sensitive detection of miRNA-21 [72]. C Schematic diagram for sensitive detection of lncRNA based on DSN and APE1 enzyme mediated triple cycle amplification [78]. D Schematic diagram for sensitive detection of circRNA based on RCA [84]Back to article page