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(A) Fully expanded leaf of 21-day-old Brassica rapa (R-o-18). The apical and basal zones represent typical sample areas for sectioning. (B) Cryo-SEM image of a leaf section in which energy-dispersive X-ray spectroscopy (EDS) measurements were taken. Leaf cells were categorized as adaxial epidermis (Ad.E.), palisade mesophyll (P.M.), spongy mesophyll (S.M.) and abaxial epidermis (Ab.E.).
