thymine
- n a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine
- He realized that "an adenine-thymine pair held together by two hydrogen bonds was identical in shape to a guanine-cytosine pair.
- Working with only the four basic nucleotides that make up all DNA adenine, cytosine, guanine and thymine he has assembled an entirely new chromosome for an entirely new one .
- In the case of genes, of course, the alphabet contains just four letters, or bases: A, T, C and G (for adenine, thymine, cytosine and guanine).