Fossils of Cyanobacteria in CI1 Carbonaceous Meteorites. 2011. Richard B. Hoover. Journal of Cosmology 13
Based on Field Emission Scanning Electron Microscopy (FESEM) and other measures, Dr. Hoover has concluded they are indigenous to these meteors and are similar to trichomic cyanobacteria and other trichomic prokaryotes such as filamentous sulfur bacteria.
He concludes these fossilized bacteria are not Earthly contaminants but are the fossilized remains of living organisms which lived in the parent bodies of these meteors, e.g. comets, moons, and other astral bodies. The implications are that life is everywhere, and that life on Earth may have come from other planets. link
It's hard to say if this on-line journal can be taken seriously given its cheesy web site covered with ads. Even the link in the title of this paper (not the link I've given you) takes you to Amazon.com!