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).
... from 2010-2014. Initial deliveries of the Typhoon to the RAF have begun. The first unit to form will be an Operational Conversion Unit[?] at RAF Conigsby[?] in ...