From Citizendium
Jump to navigation Jump to search
This article contains just a definition and optionally other subpages (such as a list of related articles), but no metadata. Create the metadata page if you want to expand this into a full article.

Nucleobase [r]: In the context of nucleic acids, the non-sugar part of nucleotides, which can be either a pyrimidine (usually cytosine, thymine, or uracil) or a purine (usually adenine or guanine).