Carbonaceous meteorites contain a wide range of extraterrestrial nucleobases.

@article{Callahan2011CarbonaceousMC,
  title={Carbonaceous meteorites contain a wide range of extraterrestrial nucleobases.},
  author={Michael P. Callahan and Karen E. Smith and H. James Cleaves and Josef Ruzicka and Jennifer C. Stern and Daniel P Glavin and Christopher H House and Jason P Dworkin},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2011},
  volume={108 34},
  pages={13995-8}
}
All terrestrial organisms depend on nucleic acids (RNA and DNA), which use pyrimidine and purine nucleobases to encode genetic information. Carbon-rich meteorites may have been important sources of organic compounds required for the emergence of life on the early Earth; however, the origin and formation of nucleobases in meteorites has been debated for over 50 y. So far, the few nucleobases reported in meteorites are biologically common and lacked the structural diversity typical of other… CONTINUE READING
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