In principle, we could be testing people, but it is premature to do that at the moment. There were no differences in temperament and background between the two groups. And even people who have emotional triggers experience emotions a lot more than they have heart attacks.

Until now, there have been two sorts of studies, one of whether triggers do exist, the other looking at the biology of patients. This is the first study to combine the two things.

Patients need to realize that they would still benefit greatly from regular physical activity.

This is such a very different type of DNA testing than people know about. It's very different from forensic DNA analysis, where you are trying to match a sample to a specific crime suspect. This is kinship, and you will never get an exact match between a mother and a son. You get what's known as a probability of a relationship.

We've had it for a few months. We're testing it to see the effectiveness.

Some companies have terminated drug testing.