Graphical Abstract (IMAGE) Tokyo University of Agriculture and Technology Caption DNAs autonomously recognized two microRNAs, miR-20a and miR-17-5p, and formed a four-way junction structure that was captured in the nanopore, showing long blocking currents. Credit Figure adapted with permission from Anal. Chem., 2018, 90 (14), pp 8531-8537. Copyright © 2018 American Chemical Society Usage Restrictions Credit required License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.