An all-purine precursor of nucleic acids.

@article{Wchtershuser1988AnAP,
  title={An all-purine precursor of nucleic acids.},
  author={G{\"u}nter W{\"a}chtersh{\"a}user},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1988},
  volume={85 4},
  pages={
          1134-5
        }
}
The theory is proposed that the pyrimidines in extant nucleic acids are postenzymatic substitutes for their isoelectronic and isogeometric position 3-bonded purine analogs xanthine and isoguanine, which were sibling products in a preenzymatic de novo purine pathway. 
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