Abstract
The cellular localization and structure of a highly ordered protein with hexagonal pattern, frequently found in some cells of leaves of different Pelargonium plants, have been analyzed extensively by negative staining and thin sections. The inclusion is located only in the vacuole of many epidermal and parenchymal cells, but never in vascular system cells. On the basis of electron microscopical examination, the protein structure is assumed to be formed by the superposition of single layers of parallel microtubules 60 (55–65) in diameter, with a center-to-center spacing of 260 (250–270) , placed one layer over another at an angle of 60°. A hypothetical model is propossed that may be applicable to many other proteins with hexagonal patterns that are widely found in different animal and plant tissues.
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