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These results indicated that not only GC to AT single base substitutions, but also tandem and multiple base substitutions were caused by two major UV-induced photoproducts, cyclobutane-type pyrimidine dimers (CPDs) and pyrimidine (6-4) pyrimidone photoproducts (6-4 PPs). In contrast, a high proportion of AT to TA transversions (56% of base substitutions) was a characteristic feature of the mutation spectrum obtained from photoreactivated plants. These results define the presence of the characteristic feature of UV-induced mutations, and provide insights int