Purified NPs and NP/cell suspensions were drop cast on to a 200 mesh carbon-coated copper grid (Agar Scientific), allowed to dry for 5 min, the excess liquid removed, and visualized immediately using a Joel JEM 1400-Plus TEM with an accelerating voltage of 80 kV. Images were captured using a GATAN OneView camera. Image post-processing was carried out using the ImageJ software.
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