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The hypothesis that RNA and DNA are products of chemical and biological evolution has motivated our search for alternative nucleic acids that may have come earlier in the emergence of life-polymers that possess a proclivity for covalent and non-covalent self-assembly not exhibited by RNA. Our investigations have revealed a small set of candidate ancestral nucleobases that self-assemble into hexameric rosettes that stack in water to form long, twisted, rigid supramolecular polymers. These structures exhibit properties that provide robust