SEARCH Articles Figures Tables Base Watson-Crick Base pairing bases Base pairs Base-pairing geometry Bases Base pair Crick Geometry Watson-Crick pairing The Structure of DNA and RNA Double Helices is Determined by Watson-Crick Base-Pair Geometry Watson Watson-Crick base pairing Watson-Crick base-paired Watson-Crick geometry Watson-Crick pairing Watson-Crick pairs