Botany online 1996-2004. No further update, only historical document of botanical science!
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a.Cross-section through the mesophyll tissue of a leaf (control); b. Cross-section through the leaf of a plant that has been cultured in an atmosphere enriched in carbon dioxide; bar: 100 µm. (P. E. KRIEDEMANN, R. J. SWARD, W. J. S. DOWTON, 1976).