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The effect of spinach ferredoxin (Fd) on cyclase activity. Assays were performed with an increasing amount of Fd added and a constant amount of solubilized membrane (PS) fractions of barley plastids. Fd could replace the soluble plastid fraction (S). Product formation increased with the amount of added Fd until saturation at 5 µg added Fd (y = 23.3x + 6.35, R2 = 0.980, p = 0.0012). 1 μg Fd corresponds to 97 pmole.
