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Molecular models of BChl syn-anti monomer stacks in tubular models of a a single stack showing the farnesyl tails alternately extending on both sides. Radius of curvature 10.2 nm. b Two syn-anti stacks interconnected by hydrogen bonds (black dotted line in the centre). The orange arrow indicates the direction of the exciton delocalization pathway over neighbouring stacks along the connecting hydrogen bonds. The models were made in Swiss-PDB Viewer and visualized using Pymol
