membrane By Ivan Suarez Robles 16 Nov, 2010 A flexible layer surrounding a cell, organelle (such as the nucleus), or other bodily structure. The movement of molecules across a membrane is strictly regulated in both directions.Related Articles: Inhibition of mitochondrial protein import by mutant huntingtinPrion-like Behavior in the Huntingtin ProteinGlossary: flavonoidsExtracorporeal Shock Wave Therapy (ESWT) for HD Patients RehabilitationGlossary: MAC