The vast majority of living organisms encode their genes in long strands of DNA (deoxyribonucleic acid). DNA consists of a chain made from four types of nucleotide subunits, each composed of: a five-carbon sugar (2'-deoxyribose), a phosphate group, and one of the four bases adenine, cytosine, guanine, and thymine.:2.1
What are the four bases used in nucleotide subunits?
{'text': 'adenine, cytosine, guanine, and thymine', 'answer_start': 275}