Figure 4.

Scheme for the evolution of major LHCs and their relatives in the major photosynthetic eukaryotic groups. An oval indicates an endosymbiotic event. The primary (1°) symbol indicates that the endosymbiont was a cyanobacterium, while secondarily derived plastids (2°) originated from eukaryotic algae as indicated by the solid arrow. A yellow circle denotes a gain of a specific LHC or LHC relative. White rectangles indicate a gene-specific loss. Dotted lines indicate the presence of an alternate timing of an acquisition event. Dashed lines indicate alternative evolutionary pathways. OHP, One-helix protein; PBP, phycobilin protein.