Calcium chelated cross section of atrial myocardium adjacent to ganglionated plexus. Stained via von Kossa technique. Slide clearly denotes intracellular stained calcium in myocytes and extracellular chelation of ganglion and nerves. After injection of 100 mM/L of NH4Ox. Arrows (right side of image) showing chelated cytoplasmic ionic calcium stores of myocytes. Arrows (left side of image) denote extracellular calcium stores chelation of ganglion and nerves. Fan Y, Scherlag BJ, Embi A et al. Neural Effects of Oxalic Acid for Atrial Fibrillation Therapy. 33rdAnnual Scientific Session Heart Rhythm. 2012; 9:S258.