Nitrogenous bases are the parts of RNA and DNA that are involved in pairing up (see also base pairs). These include cytosine, guanine, adenine, thymine (DNA) and uracil (RNA).
... (+ 1983) January 26 - Ancel Keys, scientist February 1 - S. J. Perelman[?], humorist, author February 4 - MacKinlay Kantor[?], historian (+ 1977) February 5 - ...