Adenine (A)
One member of the base pair A-T (adenine-thymine) in DNA.
adenine (a)
one of the purine nucleic acid bases that make up nucleotides, the building blocks of DNA and RNA. The antiviral drug ddI is a nucleoside analog associated with adenine.
Adenine (A)
A nitrogenous base, one member of the base pair A-T (adenine-thymine).