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Politicians have been warned not to block scientific inquiry into subjects such as stem cells and embryo research just because there is a difference of opinion on the ethics or morality of the work.

An international group of scientists investigating the possible production of artificial sperm and eggs to treat infertile couples said that moral disagreements in society should never be used on their own to stop scientific investigation.

Scientists are working on a number of ways of making stem cells derived from embryos, or ordinary tissue such as skin, and turning them in the laboratory into mature sperm and eggs that could then be used in IVF clinics for fertility treatment.

The Hinxton consortium, which was formed in 2006 to investigate the ethics and legality of stem cells, yesterday issued its recommendations for how research aimed at creating artificial gametes - sperm and eggs - should proceed.

"Societies have the authority to regulate science, and scientists have a responsibility to obey the law. However, policy-makers should refrain from interfering with scientific inquiry unless there is a substantial justification for...