in vitro By Ivan Suarez Robles 08 Feb, 2011 Latin phrase for ‘in glass’; in a test tube or other artificial environment, as opposed to inside a living organism.Related Articles: Inhibition of mitochondrial protein import by mutant huntingtinHTT Promoter Mutation has a Bi-directional Effect on HD Age of OnsetHD in The InheritanceHelp4HD International 2016 SymposiumHuntington's Disease and iVF