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

Nature, Vol. 257, No. 5521. (04 September 1975), pp. 28-32.

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bacteriorhodopsin historical protein-structure xrd

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A 7-Å 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, -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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