The purine structure consists of a pyrimidine ring (positions 1 to 6) fused to an imidazole ring (positions 7 to 9). Adenine and guanine, the two most common purines in DNA and RNA, share this core ...

DNA is fundamental to the biology of all life on Earth, but how many of us actually know what it is or what it's made of?

These nucleotides can then be further processed to form the pyrimidine bases found in DNA and RNA. The pyrimidine biosynthetic pathway is tightly regulated to ensure the proper balance of nucleotides ...