life on mars...
magnetosomal matrix: ultrafine structure may template biomineralization of magnetosomes - j microsc, vol 213, issue 2, pp. 180-197 (abstract): "The presence of the magnetosomal matrix explains all of the five properties of the biosignature of the magnetosomal chain proposed previously by friedmann et al. and supports their claim that some of the magnetite particles in the carbonate globules in the martian meteorite alh84001 are biogenic."

or, in other words, there are really martian fossils in the asteroid alh84001.