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TEM micrographs of representative niosomes negatively stained with sodium phosphotungstate. Uncoated T niosomes (panel (A)) and HA-coated Tween 20 niosomes (Panel (B), sample T 1:1). Uncoated S3 (Panel (C)) and HA-coated Span-based niosomes (Panel (D), sample S3 1:0.5).
