A popular route for protein transport into and across cell membranes is through the Sec channel. This channel seems to function by forming a dimer of two identical units, where each has a distinct role.
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Duong, F. Fraternal twins. Nature 446, 741–743 (2007). https://doi.org/10.1038/446741a
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DOI: https://doi.org/10.1038/446741a