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Endocytosis unfolds in three dimensions as a phospholipid bilayer dips into a pit around a round cargo particle and pinches off a sealed vesicle below. Every lipid is sculpted as a beaded head with paired tails, so the double membrane layer reads clearly along the flat sheets, around the curve of the pit and in the ring of the budding vesicle. A memorable way to teach how cells take in material in biology classrooms, or to display on a science desk.

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