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most tissue culture cells readily take up ASOs (phosphorothiote linkage) in a non-productive way, meaning that no antisense effect is observed. In contrast to that conjugation of ASO with ligands recognised by G-coupled receptors leads to an increased productive uptake. Next to that classification (non-productive vs. productive), cell internalisation mostly proceeds in an energy-dependant way (receptor mediated endocytosis) but energy-independent passive diffusion (gymnosis) may not be ruled out. After passing the cell membrane, ON therapeutics

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