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Effect of surface functionalization on penetration force. Left: combined histogram of first breakthrough force for all surface functionalizations, ranked from top to bottom in increasing median force. The white dotted box indicates mercaptopropanol control. Brackets on the margin denote unpaired t-test (T) and the black dotted line indicates the KS test. Right: corresponding histogram for lipid bilayer stacks. To see this figure in color, go online.
