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The three-dimensional arrangement of the intestinal smooth muscle in the ammocoetes of the lamprey (Lampetra japonica) was examined by scanning electron microscopy (SEM) after removal of the intestinal mucosa. In cross section of the posterior midgut, its wall was composed of the parietal wall and the typhlosolar wall of the spiral fold, lining a horseshoe-shaped space, and had two distinct muscle...
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