The creation of part-human, part-animal embryos looks set to be approved by the fertility regulator tomorrow.
These "hybrid" embryos would be used for research into incurable diseases such as Alzheimer's.
The news follows a surprise Government decision not to ban the controversial research.
A shortage of human eggs has led two groups of scientists to appeal to the Human Fertilisation and Embryology Authority for permission to make hybrid embryos from human skin cells and animal eggs.
Cows' eggs are most likely to be used, because they are in plentiful supply.
Scientists say the creation of hybrid embryos has the potential to revolutionise the treatment of debilitating diseases which affect millions.
But opponents believe mixing of human and animal genetic material defies nature.
They are also unhappy about the destruction of embryos that such research inevitably entails.
The scientists' hopes to use hybrids were initially jeopardised by a proposal to outlaw such research under a shake-up of outdated fertility laws.
But in May, Labour ministers dramatically changed their minds.
However, only scientists who are researching serious diseases - and are licensed by the HFEA - will be allowed to carry out such procedures.
While the fertility watchdog has yet to rule on the issue, its ethical and scientific experts are in favour of the creation of hybrids.
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