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).
... the census2 of 2000, there are 53,364 people, 21,348 households, and 13,363 families residing in the city. The population density is 481.1/km² (1,246.0/mi²). ...