Neoangiogenesis of transplants implanted into the brains of newborn rodent hosts was evaluated by immunohistochemistry for 2 weeks after the operation. The use of species-specific antibodies directed against mouse endothelial cells demonstrated the respective participation of the host and the donor in the formation of new vessels in the graft after crossed rabbit into mouse and mouse into rat transplantation experiments. We show that blood vessels made by host endothelial cells begin to penetrate the transplant 24 h after grafting, and cross it completely by 72 h. Simultaneously, host astrocytes invade the transplant.
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