Fig. 2.

Unrooted ML tree of D1 amino acid sequences. Different types of D1 are denoted G0 to G4, representing Group 0 to Group 4 and based on the categorization by Cardona et al. (2015). FaRLiP D1 denotes the standard D1 used in the far-red light acclimation response, whereas FaRLiP ChlF denotes the divergent D1 known to confer “chlorophyll f synthase” activity to Photosystem II. Group 2 or rD1 denotes the “rogue” D1, a widespread but atypical form of D1 of unresolved function. The subtree in light gray zooms in on the Group 4 D1 of the Gloeobacterales. The dark gray vertical branches represent intraspecific identical D1 forms (branches of no length). Scale bar denotes amino acid substitutions per site.