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·OH yields (open circles, open squares, open diamond, open triangle) generated by LED-light irradiation of undiluted and 2- to 8-fold diluted WLE for 0, 10, and 20 s, and ·OH yields (filled circle, filled triangle) generated by irradiation (10 s) of undiluted and eightfold diluted WLE subjected to prior LED-light irradiation for 20 min without DMPO. Each value indicates the mean of triplicate determinations with the standard deviation
