Fig. 7

Schematic model of the horizontal transfer of PHRPA from an unknown donor. We found multiple RPA homologs in some species. It remains unclear if this is the result of gene duplication events in these lines and/or if there were multiple RPA precursors from different donors. Phylogenetic analysis indicates that PHRPA has evolved in parallel to the eukaryotic core RPA protein and was later introduced into the common ancestor of mono- and dicotyledonous plants. The PHRPA donor, however, remains unknown