Stripped down genetic code provides candidates for first molecules of life.
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References
Reader, J. S. & Joyce, G. F. A ribozyme composed of only two different nucleotides. Nature, 420, 841 - 844, (2002).
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Ball, P. Back two bases. Nature (2002). https://doi.org/10.1038/news021216-9
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DOI: https://doi.org/10.1038/news021216-9