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Figure 1.
Figure 1: Structure of the Sec23/24 -Sar1 pre-budding complex.
Ribbon representation is shown as successive 90° rotations.
Sec23 is yellow, Sec24 green and Sar1 red. a, Front view along
the dyad relating the coat subunits, with the membrane-proximal
surface facing forward. b, Side view. The grey line indicates
the curvature of a 60-nm COPII vesicle, drawn to scale. c, Top
view. The three regions of Sar1 that would face the membrane are
labelled C, N and  2
- 3.
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