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).
... Key (http://members.tripod.com/~sarasvati/alphabet.html) The Sanskrit Alphabet (http://www.americansanskrit.com/athome/online01/alphabet.html) The earlies ...