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Rows of rounded hydrophilic heads line the top and bottom of this phospholipid bilayer membrane section, with wavy fatty acid tails packed between them. Small cholesterol clusters sit tucked among the tails, larger embedded proteins span the full thickness at each end and on top, and branching chains rise from the outer surface. The block is cut cleanly so the double layer reads at a glance from the side. It works well as a cell biology teaching aid, a lab desk display or a hands-on model for explaining how cell membranes are built.

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