This diagram depicts the chemical structure of pyrimidine, a six-membered aromatic ring with two nitrogen atoms at positions 1 and 3 (highlighted in blue). The remaining positions are occupied by ...

This image illustrates the chemical structures of the five main nucleobases found in DNA and RNA. The pyrimidines, thymine (DNA), uracil (RNA), and cytosine are shown on top while the purines, adenine ...

Rather, DNA was first identified in the late 1860s ... In other words, the total amount of purines (A + G) and the total amount of pyrimidines (C + T) are usually nearly equal.

Three such drugs used in the study—raltitrexed, N-(phosphonacetyl)-l-aspartate (PALA), and brequinar—work to prevent cancer cells from making pyrimidines, molecules that are an essential component to ...