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Figure 3.
Figure 3: Redox-active cofactors and electron transfer chain.
a, View along the membrane plane. The cofactors of the electron
transfer chain (P[D1]/P[D2], Chl[D1]/Chl[D2], Pheo[D1]/Pheo[D2],
Q[A]/Q[B]) are related by the pseudo-C2 axis (arrow). Fe^2+
(blue), Mn (red) and Ca^2+ (yellow) ions are shown as spheres.
b, Schematic representation of the view in a. Selected distances
(in angstroms) are drawn between cofactor centres (black lines)
and edges of  systems
(red dotted lines).
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