Source:http://linkedlifedata.com/resource/umls/id/C1157095
GO: The chemical reactions and pathways involving a nucleobase, a nitrogenous base that is a constituent of a nucleic acid, e.g. the purines: adenine, guanine, hypoxanthine, xanthine and the pyrimidines: cytosine, uracil, thymine. [GOC:ma]