(A) BT3049S dimer CD (PDBid 3V9F) viewed looking toward the membrane surface along the diad axis.
(B) BT3049S dimer CD viewed from the side, 90° from (A), with the putative membrane below.
(C) BT4663S dimer AB (PDBid 4A2L) viewed as in (B).
Each polypeptide chain is drawn in ribbon representation with spectral coloring, blue/green (N-D1) to yellow/orange (D2) to red (D3-C).