Final Draft of the original manuscript: Golub, M.; Hejazi, M.; Koelsch, A.; Lokstein, H.; Wieland, D.C.F.; Zouni, A.; Pieper, J.: Solution structure of monomeric and trimeric photosystem I of Thermosynechococcus elongatus investigated by small-angle X-ray scattering In: Photosynthesis Research (2017) Springer DOI: 10.1007/s11120-017-0342-6