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Nature. 1975 Sep 4;257(5521):28-32.

Three-dimensional model of purple membrane obtained by electron microscopy.


A 7-A resolution map of the purple membrane has been obtained by electron microscopy of tilted, unstained specimens. The protein in the membrane contains seven, closely packed, alpha-helical segments which extend roughly perpendicular to the plane of the membrane for most of its width. Lipid bilayer regions fill the spaces between the protein molecules.

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