[The characteristics of the cell aggregation of the tectum mesencephali in chick embryos and of the cerebral cortex in newborn rats in mixed cultures].

To determine species-specific cells in mixed culture, obtained after simultaneous cultivation of dissociated cells of chick embryo midbrain tegmentum and newborn albino rat cerebral cortex, various DNA amounts were used for testing chick and rat cells. The study of cell structure of the aggregates revealed that in addition to the aggregates consisting of cells belonging to only one species of animals, chimera aggregates also exist made of cells of both species of animals, basically of chick embryo glial cells and newborn rat neurons.