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Wikipedia definition
1. 2R hypothesisThe 2R hypothesis or Ohno's hypothesis, first proposed by Susumu Ohno in 1970, is a contested hypothesis in genomics and molecular evolution suggesting that the genomes of the early vertebrate lineage underwent one or more complete genome duplications, and thus modern vertebrate genomes reflect paleopolyploidy.
Read “2R hypothesis” on English Wikipedia
Read “2R仮説” on Japanese Wikipedia
Read “2R hypothesis” on DBpedia

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