Observation and Analysis of Martian Meteorite Y-000593: Evidence of Biosignatures Spencer, L. M. ; McKay, D. S. ; Gibson, E. K. ; Thomas-Keprta, K. L. ; Wentworth, S. J. ; Clemett, S. J. Abstract Publication: Meteoritics and Planetary Science Supplement Pub Date: August 2008 Bibcode: 2008M&PSA..43.5114S