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The invention is one of a series of patents from the biomolecular engineering department concerning sequencing of DNA using a nanoscale hole or 'nanopore'. When a voltage is applied across the nanopore, DNA is pulled through the hole in single file order. The bases that make up the DNA are read as they transit the pore. In this particular patent, the inventors combined voltage feedback control with an enzyme to precisely regulate movement of the DNA. This results in improved DNA sequencing accuracy.