The nature of the nodes is more readily seen in Figs. 4-6, in which it is apparent that they arise from the presence of electron-opaque material between the central regions of the more distal cisternae. The nodes display a superficial resemblance to the grana of chloroplasts. The distribution of the intercisternal material across the parabasal body may be significant from a functional point of view, as will be indicated later, and will, therefore, be described in some detail.
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