Through or across a membrane.

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trans·mem·brane (')tran(t)s-'mem-.brān, (')tranz- adj taking place, existing, or arranged from one side to the other of a membrane <a \transmembrane potential> <\transmembrane proteins>

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trans·mem·brane (trans-memґbrān) crossing a membrane, such as the plasma membrane.

Medical dictionary. 2011.

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