Fig. 3
From: Structure of a cyanobacterial photosystem I tetramer revealed by cryo-electron microscopy

Interactions at the Type 1 interface. a Structure of a dimer unit (dimer A-B) from a PSI tetramer viewed along the membrane normal from the stromal side. b–d Interactions between PsaL (A) and PsaL (B). e Interactions between PsaB (A) and PsaL (B). f Pigment interactions between PsaL (A) and PsaL (B)