The reaction center found in Rhodopseudomonas bacteria is currently best understood, since it was the first reaction center of known structure and has fewer polypeptide chains than the examples in green plants.
Reakcioni centar koji je prisutan u familiji bakterija Rhodopseudomonas je trenutno najbolje izučen, pošto je to bio prvi reakcioni centar sa poznatom strukturom i ima manji broj polipeptidnih lanaca nego ekvivalentni kompleksi kod zelenih biljaka.