Source:http://linkedlifedata.com/resource/umls/id/C1157241
GO: The chemical reactions and pathways resulting in the formation of nicotinamide adenine dinucleotide, a coenzyme present in most living cells and derived from the B vitamin nicotinic acid; biosynthesis may be of either the oxidized form, NAD, or the reduced form, NADH. [GOC:jl, ISBN:0618254153]