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Effect of a pretreatment in darkness on CPD photoreactivation. Five-day-old seedlings grown in continuous white light were either kept in white light or transferred to darkness (D) for 5 h. Both groups of seedlings were exposed to UV-B (3 kJ m−2) and allowed to photorepair under white light. The relative amounts of CPDs were measured by ELISA. The results represent an average of at least two independent experimental values. Error bars are se.
