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Ribbon diagrams of BLUF domain crystal structures enclosing the photoactive part as proposed by the Trpin model represented by the 1YRX crystal structure (AppA protein from Rhodobacter sphaeroides),43 coordinates set A (left), and the Trpout model represented by the 1X0P crystal structure (Tll0078 protein from Thermosynechococcus elongatus BP-1),21 coordinates set A (right).
