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Despite extensive use of arginine‐rich cell‐penetrating peptides (CPPs)—including octaarginine (R8)—as intracellular delivery vectors, mechanisms for their internalization are still under debate. Lipid packing in live cell membranes was characterized using a polarity‐sensitive dye (di‐4‐ANEPPDHQ), and evaluated in terms of generalized polarization. Treatment with membrane curvature‐inducing peptides...
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