EPG Systems 1 article published in JoVE Environment A New Application of the Electrical Penetration Graph (EPG) for Acquiring and Measuring Electrical Signals in Phloem Sieve Elements Vicenta Salvador-Recatalà1, W. Freddy Tjallingii2 1Department of Plant Physiology and Biophysics, University of Würzburg, 2EPG Systems, Wageningen, The Netherlands Electrical Penetration Graph (EPG) is a well-established technique for studying the feeding behavior of stylet-bearing insects. Here we show a new application of EPG as a non-invasive tool for the acquisition of intracellular electrophysiology recordings of sieve elements (SEs), the cells that form the phloem vasculature in plants.