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The neural plate formation in chick embryo is due to a change in cell shape. The cubic cells (Plate I, fig. 1) become cylindrical (Plate II, fig. 3). Their adhesion increases and microtubules appear in the cytoplasm. The neural tube formation is due to the cells, which become bottle-shaped. These cells are linked at the surface of the neural plate by occludent junctions (Plate IV, fig. 8). The cells contract in the region where there are microfilaments between the junctions and expand at the opposite...
The ultrastructure of the testis of the chilopod Lithobins forficatus L. during the fifth larval stage has been studied. The testis wall is constituted of an epithelial layer, a thin basement membrane, two concentric muscle layers, a sheet of extremely interdigitated epithelial cells. The testis lumen is filled with spermatogonia and spermatocytes. The muscle fibers contain a single nucleus; the contractile elements present a peculiar organization: the number of actin filaments at I band level,...
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