Efficient photochemical activity and strong dichroism of single crystals of reaction centers from Rhodopseudomonas viridis

Crystallized reaction centers from Rhodopseudomonas viridis (i) are
photochemically active with electron transfer from the special pair
to the quinones, (ii) show dichroism giving valuable information on
the orientation of the different chromophores and (iii) allow
chemical treatment in the crystalline phase.