We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleWhat is life--and how do we search for it in other worlds?AuthorsMcKay CPPublicationPLoS biology, 2004, Vol 2, Issue 9, pE302ISSN1545-7885Publication typearticleDOI10.1371/journal.pbio.0020302