NEW POSSIBILITIES OF MAMMAL CLONING

Knowing the role of human genes in cell and tissue , economy can't be achieved only if genes of interests are transferred into the genome of animal s realizing the humanization of experimental animal models. Because until this moment this can't be achieved on ly at the beginning of life of the individual, ther e was the need of creating embryos from cells which genome contained previously transferred genes of interest. In conclu sion, in creating and developing cloning methods we have to consider specific methods used in embryology, molecular biology and transgenesis. Pluripotent embryonic stem cells or even adult stem cells can be used not only for realizing transgene sis for genes of interests, but also for their further" tra nsformation" into embryos.