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Cell volumes measured in both epidermal and mesophyll tissues. Range of cell volumes observed during expansion in the adaxial epidermis (top left), the abaxial epidermis (top right), the palisade mesophyll (bottom left) and the spongy mesophyll (bottom right) of leaf 6 of the Arabidopsis rosette. The graphs represent the minimum and maximum cell volume measured; the lines in the middle of the graphs indicate the average cell volume. Its value is shown for the different time points (days after initiation of leaf 6).