In frozen sections and whole mount preparations of the normal soleus, diaphragm, or intercostal muscles of the rat, myoneural junctions of different AChE and silver staining intensities were regularly observed. Muscle fibers of different diameters showed end-plates of varying staining intensities. No correlation was found between a certain staining intensity and diameter of the end-plates or between muscle fiber diameters and the ratio of pale to strongly stained end-plates. There was, however, a tendency for the smaller muscle fibers to have end-plates of smaller mean diameter than those in the larger muscle fibers.
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