phosphorylation By Ivan Suarez Robles 08 Feb, 2011 The process of adding on a phosphate group to a molecule. Often used in cell signaling to turn molecules on or off.Related Articles: Sheep in HD ResearchHuntingtin Protein and Protein AggregationThe Washington University Medical Center in St. Louis Center of ExcellenceDietary Restriction"Normal" huntingtin and Huntington's disease