Projection structure of a gap junction membrane channel at 7 Å resolution

Abstract
Electron cryo-microscopy and image analysis of frozen-hydrated, two-dimensional crystals of gap junction membrane channels formed by recombinant alpha 1 connexin (Cx43) reveal a ring of transmembrane alpha-helices that lines the aqueous pore and a second ring of alpha-helices in close contact with the membrane lipids.
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