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A, a | the 1st letter of the Roman alphabet | |
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A, adenine | [in biochemistry] purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA | |
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A, vitamin A, antiophthalmic factor, axerophthol | any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | |
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amp, A, ampere | the basic unit of electric current adopted under the Systeme International d'Unites | |
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A, deoxyadenosine monophosphate | one of the four nucleotides used in building DNA, also known as deoxyadenylate, or dAMP; all four nucleotides have a common phosphate group and a sugar (ribose) | |
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A, type A, group A | the blood group whose red cells carry the A antigen | |
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A, angstrom, angstrom unit | a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation |