Fig. 3From: A pump-free and high-throughput microfluidic chip for highly sensitive SERS assay of gastric cancer-related circulating tumor DNA via a cascade signal amplification strategyAgarose gel electrophoresis of CHA–HCR amplification products. Lane 1: marker; Lane 2: target (PIK3CA E542K); Lane 3: hp1-1; Lane 4: hp2-1; Lane 5: CHA product; Lane 6: hp3-1; Lane 7: hp4-1; Lane 8: HCR productBack to article page