[The bone marrow origin of the cells encapsulating a foreign body in the peritoneal cavity of xenogeneic radiation chimeras].

The origin and ultrastructure of the cells, encapsulating foreign body in peritoneal cavity of xenogeneic (rat in mouse) radiation chimeras was studied. The donor nature of the cells was identified by their karyotype and by DNA hybridization with rat ID-element. Cells with ultrastructural characteristics of fibroblasts encapsulating foreign body in the peritoneal cavity of the xenogeneic radiation chimeras were shown to originate from the transplanted (donor) bone marrow.