Fig. 4: Cartoon representation of exocytoplasmic domains (ECD) with cysteines involved in disulfide bridges represented as sticks.

a, b Disulfide bonds are located within ECD1 and ECD2 and one disulfide bond connects ECD1 and ECD2 (C641-C1490). N- and C- halves are colored as dark green and light green, respectively. The associated EM density is shown as purple mesh with σ = 5.0.