In the adult, neural stem cells can be found in very specific areas of the brain where replacement of nerve cells is seen. Ovarian Function and Stem Cells i am Science directed at clinical application. Even when transdifferentiation has been detected, only a very small percentage of cells undergo the process. For example, a mutant gene may produce an abnormal phenotype in an organism. Pera will assume the post in January, The older generation have less stem cells naturally being released from the bone marrow - so more frequent doses might be beneficial.