parasite ROOT 0.5 free living species X 1.5 parasite EF-BC 1.5 parasite B-C 2.5 parasite B 3.5 parasite C 0.5 parasite E-F 0.5 parasite E 4.5 parasite F 2.5 Gene EFBC Gene BC Gene B Gene B1 Gene B2 Gene C Gene D1 Gene C1 Gene EF Gene E1 Gene F1