| http://www.w3.org/ns/prov#value | - Another approach has been to add a ligand such as biotinylated epidermal growth factor (EGF) to streptavidin-nanocrystals at sub-stoichiometric ratios, such that most nanocrystals bind no EGF, some bind one EGF, and almost none bind two EGF molecules (Lidke, D. S., et al. (2005).
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