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Fig.
15.3-2. Transverse section of wood of maple (Acer). This
material was collected from the sapwood of a living tree, so the
ray cells (arrows) were alive and filled with starch. If it had been
collected from heartwood or from a dead piece of lumber, the cells would have
been empty. In this particular sample, there are very few axial cells with any
starch in them.
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