This article's examples use DNA, which consists of two strands of adenine (A), cytosine (C), thymine (T), and guanine (G) nucleotides.

Adenylate kinase (AK) is a phosphotransferase enzyme that catalyzes the interconversion of adenine nucleotides, and plays an important role in cellular energy homeostasis.

Of the four nucleotides that comprise DNA molecules, adenine, turns out to have a particularly high affinity for gold.