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Figure Abbrevations: Ad, adaxial; Ab, abaxial; E, epidermis; P, palisade mesophyll; S, spongy mesophyll. Fig. 1. Illustrated view of an oblique-paradermal and transverse leaf section, and their relationship for a dorsiventral leaf type. The oblique-paradermal section has been divided into a series of images and the variables used to determine Ames/A, Ames/V, and Vmes/V are indicated. See text for explanation of variables used in the computation of mesophyll parameters.

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Fig. 2. (A) Internal profile of Ames/A and (B) chlorophyll concentrations from the adaxial to abaxial epidermis for juvenile, transitional and adult leaves of Eucalyptus globulus ssp. globulus. Values are means ± SE for 3–7 leaves of each leaf type.

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Fig. 3. (A) Internal profile of chlorophyll a:b and (B) the ratio of mesophyll cell volume per unit mesophyll volume (Vmes/V) from the adaxial to abaxial surface of juvenile, transitional, and adult leaves of Eucalyptus globulus ssp. globulus. Values are means ± SE for 3–5 leaves of each leaf type.

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