SANS for the LH2 and RC of Rb. sphaeroides. (A) SANS data for LH2-LDAO mixtures in 0, 10, 20, 45, 80, and 100% D2O. (B) The Guinier fit for LH2-LDAO mixtures in different concentrations of D2O. Data are shifted along the y axis for comparison. (C) The normalized P(r) profile for LH2-LDAO mixtures in 45% (blue curve) and 10% D2O (red curve). (D) The SANS data for LH2-LDAO mixtures in 10% D2O (•) and the predicted SANS pattern (red line) calculated from the crystal structure for LH2 of Rps. acidophila. (E) The SANS data and Guinier fit (inset) for RC-LDAO mixtures in 100% D2O.