RespirAct® RA-MR™ Part 129700 The RespirAct® RA-MR™, is a blood gas control system and investigative device used to stimulate vascular reactivity. RA-MR™ is designed to precisely target and control PCO2 and PO2 in spontaneously breathing subjects and is MRI compatible. The RespirAct® RA-MR™ has not been evaluated by the FDA and is distributed by Thornhill Medical to collaborators for use in IRB approved basic physiological research studies. Disposable Subject Interface Onsite/Remote Installation and Training Annual Service and Support Fee