Researchers inflict pain in hope of easing suffering

· Subjects volunteer for shock and heat ordeals · Study could help diabetes and shingles sufferers

Animal organ trials ‘within five years’

Clinical trials using animal organs to keep humans alive may be just five years away, an expert has said.

What have guinea pigs ever done for us?

Millions of lives have been saved by animal experiments, say scientists. Vivienne Parry examines the key research.

Scientists sidestep stem cell dispute

New hope of making human tissue without creating more embryos.