are found in cytochrome b₆f: chlorophyll a, ?-carotene, and heme c_n (also known as heme x).

The inter-monomer space within the core of the cytochrome b6f complex dimer is occupied by lipids, which provides directionality to heme-heme electron transfer through modulation of the intra-protein dielectric environment.

Biological function

In photosynthesis, the cytochrome b₆f

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