The proliferative system of the small intestinal cryptic epithelium in intact mice in circahoralian rhythm of mitotic activity of its cells (with a 80-140-min period) is characterized by spatial and time organization. The characteristics of the studied proliferative system do not dub it in individual parts, but present new properties intrinsic of this system in general. The features are greatly similar to the features of spatial and time organization of this proliferative system in circadian rhythm of cell division.
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