Figure 5.

Flash-induced FTIR difference spectra (1800–1200 cm⁻¹) of the S-state cycle of PSII core complexes from WT* (black lines) and D1-N298A (red lines) in solutions measured upon the (a) first, (b) second, (c) third, and (d) fourth flashes. The spectra of D1-N298A were scaled with a factor to adjust the intensity of the ferricyanide CN peak at 2116 cm⁻¹ (not shown) in the first-flash spectrum to that of WT*.