In vivo electrophysiology for pain drug discovery In vivo electrophysiology E-Phys is an independent contract research organization (CRO) specialized in preclinical electrophysiology in anesthetized rodents. Our missions E-Phys provides decisive electrophysiological data to validate new pain therapeutic targets and/or to assess drug efficacy in recognised pain models.E-Phys combines in vivo electrophysiology expertise with knowledge to deliver a complete preclinical data package. Why us More than 20 years experience in physiology in anesthetized rodent models.Commitment to deliver reliable, decision-making data at competitive prices.