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This question that I asked on StackExchange a while ago seems relevant here http://biology.stackexchange.com/questions/2874/why-are-there-exactly-four-nucleobas

by tunnuz 10y ago

This question that I asked on StackExchange a while ago seems relevant here http://biology.stackexchange.com/questions/2874/why-are-there-exactly-four-nucleobases-in-dna http://biology.stackexchange.com/questions/2874/why-are-ther...