On 9 August, 2001, President George Bush declared that federal funding would only be available for research using existing stem cells - meaning that no new lines could be created, whether from existing embryos or cloned embryos.

BBC: NEWS | Americas | Q&A: The politics of stem cells

However, any such research, whether on cloned material or not, would require alterations to the 1990 Human Fertilisation and Embryology Act.

BBC: UK to 'approve therapeutic cloning'

For every 100 eggs used, a researcher is lucky to end up with a single cloned calf or a solitary pig in a poke.

ECONOMIST: Cloning around

Bad news: Any idea that works will be cloned within days or hours.

FORBES: Digital Rules

There are plenty of volunteers willing to donate cells or provide a cosy womb for the cloned creation.

ECONOMIST: Cloning still looks far too dangerous to attempt

She does not go on about the cloned humans, chimeras, drug- or chip-driven zombies, miracle cures and genetically enhanced super-people that litter so many books in this field.

ECONOMIST: Bioethics

In 1990 they cloned a breakthrough product: ciliary neurotrophic factor, or CNTF, a nerve growth hormone they later named Axokine.

FORBES: Hunger Pangs

We can't tell what's going on exactly, but it appears that the twisty E81 that we saw a while back could've very well been a genuine article -- either that, or it was scooped up well ahead of release in China and cloned ages before Nokia had intended the phone to be announced.

ENGADGET: Nokia Twist launching on Verizon starting September 13