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Representative images of three basil varieties (five plants for each variety) grown at constant PAR and artificial UV-B radiation (1.35 W m−2) 6 h per day after 8 days of treatment. Ocimum basilicum var. Genovese (GB) (top), Ocimum × citriodorum (CB) (middle), and Ocimum basilicum var. purpurascens (PB) (bottom).
