| Here, purines form hydrogen bonds to pyrimidines, with adenine bonding only to thymine in two hydrogen bonds, and cytosine bonding only to guanine in three hydrogen bonds. |
| Analysis of purines and pyrimidines in blood, urine, and other physiological fluids. |
| Purines and pyrimidines are considered as complex molecules themselves because they are never synthesized as such in vivo. |
| When I was first exposed to biochemistry, only a number of small biological building blocks, such as sugars, amino acids, purines, pyrimidines, fatty acids, and a few others, had been identified. |
| It serves as a building block for the synthesis of purines, pyrimidines and many amino acids and lipids and is a key molecule in one-carbon metabolism. |
| Exposure to UV light can cause adjacent pyrimidines to dimerize, while oxidative damage from free radicals or strong oxidizing agents can cause a variety of lesions that are mutagenic if not repaired. |
