The origin of fibroblast-like cells of the capsule around a foreign body in the spleen, liver, peritoneal cavity, subcutaneous connective tissue of mice, the localization of cells-precursors, their proliferative potencies and the ability to migrate through blood were studied using 3H-thymidine autoradiography. Precursors of the inflammation focus cells (irrespective of localization) reproduce intensively outside the limits of intraorganic connective tissue, supposedly, in hemopoietic organs of the bone marrow type and migrate, through the blood channel, into tissues (inflammation foci), where they terminate their differentiation.

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