bonnie tyler wrote the song holding out for a hero.
bonnie tyler wrote the song holding out for a hero.
who wrote the song holding out for a hero?
bonnie tyler
Na
Na
the extension of human lifespan, in terms of useful, quality, years added to life, has been a goal for many since time immemorial. and while a goal whose attainment was thought improbable, or at least achievable only in the far distant future, the discovery that animals can be cloned has brought the goal of rejuvenation much closer. the remarkable discovery that animals can be cloned showed that the nucleus of an old cell can be used as a donor in so-called “nuclear transfer” experiments where an old nucleus is transferred into a recipient egg whose own nuclear material has been removed. the “reconstructed” egg is then prompted to engage development and develops through an embryonic stage that results, once the embryo is implanted into a surrogate mother, into a new born. thus an old cell can give rise to a newborn, which has a typical lifespan: the age of the donor cell is “wiped clean” and returned to a youthful state. notably, in classical animal cloning the rejuvenation process involves a return to an embryonic form. thus the specialized functions of the adult cell are also “wiped clean” and returned to an embryonic cell type. and in classical cloning passage through this embryonic state is a must for the age of the cell to be “wiped clean”.
partial cloning