American Heritage Dictionary
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Century Dictionary
GNU Webster's 1913
WordNet
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Elsewhere on the web
The building blocks of DNA-adenine (A), guanine (G), cytosine (C) and thiamine (T) are not easy chemicals to artificially synthesize into chromosomes.— Biosingularity
The riboswitch Block's team studied grabbed onto a molecule called adenine, the nucleic acid dubbed "A."— Biosingularity
Whenever the riboswitch gripped a free-floating adenine, a gene that makes a protein crucial to adenine production stopped working correctly.— Biosingularity

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