American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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Elsewhere on the web
Erwin Chargaff published a paper in which he described something he found extraordinary: the ratios of adenine to thymine were equal, as well as cytosine to guanine.— Citizendium, the Citizens' Compendium - Recent changes [en]
Abstract: NH stretching excitations of DNA oligomers containing 23 alternating adenine-thymine base pairs are studied in femtosecond two-color pumpprobe experiments.— CiteULike: Everyone's library
DNA • Dr. David Deamer, a cell biologist at the University of California Davis, in 1988 published several tapes based on a measuring of the rhythm of the four DNA bases (adenine, thymine, guanine and cytosine) as they traveled along the helix.— Recently Uploaded Slideshows
A mutation exists when a base pair on the two strands of DNA is replaced with a different but otherwise normal base pair (i. e. adenine-thymine or guanine-cytosine).— Science and Reason
Remember good ol 'adenine, thymine, guanine and cytosine?— Popular Science

American Heritage Dictionary (1)
Century Dictionary (1)
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