[Comparative study of mouse teratoids developed from blastocysts and embryos at the three germ layer stage].

Germs of three stages: blasocyst, three layer germ cylinder, as well as head-fold and neural plate were implanted under the testicular capsule of mice, CBAXC57Bl line. Teratoids developed at the place of implantation are represented by the derivatives of all germ layers, as well as by some organic structures. The method for an experimental production of teratoids by means of transplantation of developing embryos is discussed as one of the methods for experimental histology. At the same time, possible tissue determination in embryos which do not undergo normal gastrulation is considered.