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Photos of the analyzed plant material. (a) Broccoli (Brassica oleracea L.); (b) Daikon (Raphanus raphanistrum subsp. sativus (L.) Domin); (c) Mustard (Brassica juncea (L.) Czern.); (d) Rocket salad (Eruca vesicaria (L.) Cav.); (e) Watercress (Nasturtium officinale R.Br.).
