GC-MS on the Viking 1976 Mars missions did not detect organic molecules on …

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We are indebted to conversations with many members of the Mars Architecture Definition Team. This work was funded in part by the National Aeronautics and Space Administration Exobiology and Astrobiology programs.

^* To whom reprint requests should be addressed. E-mail: [email protected] .

Article published online before print: Proc. Natl. Acad. Sci. USA, 10.1073/pnas.040539497.

Article and publication date are at www.pnas.org/cgi/doi/10.1073/pnas.040539497