base By Ivan Suarez Robles 14 Nov, 2010 In genetics, a DNA letter (A,C,G or T). Also known as a nucleotide.Related Articles: Glossary: substantia nigraHOPES Stories: "Bryan's Dad Wants Ordinary Back"Stories of HOPES: "Like Father Like Son?"Cueing Device For Improving Gait Ability in Parkinson's Disease and Other Motor DisordersHelp4HD Second Annual Symposium