Figure 5.

Alignment of PSBS and a group of selected SEP sequences from early land plants. Two representative PSBS sequences including only the first (I) and third (III) helices show high similarity to four SEPx sequences from S. moellendorffii, Selaginella lepidophylla and P. patens. Identical amino acids shown in white are surrounded by a black and similar amino acids by a grey box. Note the conserved valine (V) in both groups (position V-3), a potential CB position at which most other protein families carry an asparagine (N-3) or histidine (H-3).