If somebody has copied the substance and is not very careful with the regulation of the genes, then using the substance would be extremely dangerous.

We didn't develop it any further. So it simply remains in the fridge. And we maintain very close controls, so I'd be extremely surprised if anything we made got on to the black market.

It would take a fairly advanced lab to make it. But it would be very irresponsible for a number of reasons. For a start, we only went as far as testing it on mice. To use it in the human body would be playing with fire.

Somebody was using the pencil.

You have to be careful how you're using the word boycott.

Once and for all, I did not use steroids or any other illegal substance.