A White Paper for the 2020 Planetary Sciences Decadal Survey of the National Academies MASEX - A Dedicated Life Detection Mission on Mars Authors: Y. Lin 1 (ying.lin@jpl.nasa.gov, 818-393-6381), F. Zhong 1 , B. Henderson 1 , V. Abrahamsson 1 , I. Kanik 1 , J. Gross 1 , L. Newlin 1 , W. Shubert 1 , L. L. H. Matthies 1 , C. D. Edwards 1 , J. Bapst 1 , J. Balaram 1 , and T. Tzanetos 1 1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA View of Mars North Polar region by Phoenix Spacecraft NASA/JPL