A screenshot of a Google Doodle, which is drawn in light and dark purple and shows a cartoonish DNA double helix, the structure of guanine and a phosphate group, and small cartoons of a chromosome and ...
In the few years since the introduction of peptide nucleic acid, or PNA (P.E. Ni et al., Science 254:1497-1500, 1991)-a nucleic acid analog with a peptide rather than sugar-phosphate backbone-no less ...
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