Fig. 6.

Peripheral lipid/carotenoid-containing region in the antenna domain of the GsbRC. A In both the GsbRC (green) and PSII (brown), two lipids and a carotenoid (sticks with large radii) are found in this location that correspond to the “L” labels in Fig. 5 and Fig. S13. B The same location, but showing only the tetrapyrrole rings from the GsbRC (green), HbRC (yellow), and PSI (blue). Those HbRC antenna BChls not found in the GsbRC structure in this region are shown with sticks of larger radii. The BChl sites in the HbRC not found in the GsbRC are conserved in PSI (but not in PSII), with only two exceptions that are circled with a red dashed line. The top is a site unique to the HbRC and the bottom is a site conserved in all the RCs, including PSII, except the GsbRC