Our aggression is a deep instinct which survives in all kinds of manifestations in modern man.

It is time my colleagues got real. All British universities doing worthwhile research use animals, and, instead of hiding, they should be boasting of their achievements.

We live longer and healthier lives than ever before. Animal research has improved the treatment of infections, helped with immunisation, improved cancer treatment and had a big impact on managing heart disease, brain disorders, arthritis and transplantation.

I went to school with butterflies of fear every day for years - from primary school onwards - not just worried about being bullied by classmates, but by teachers.

There were never any doctors in my family. But my grandparents and my mother had a strong social conscience that was formative.

Parents should talk to their children, even when they are babies and can't talk back.

Ethics is not routinely taught to science students except in medicine, and I think it should be.