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There is an urgent need for development of rapid and inexpensive techniques for detection of microRNAs (miRNAs), which are potential biomarkers of various types of cancer. In this paper, we describe a multiplexed electrochemical platform for determination of three cancer‐relevant miRNAs: miR‐21, let‐7a and miR‐31. The strategy combines the use of magnetic beads (MBs) modified with a commercial antibody...