Your genes and environmental factors seem to play a role.

For one thing, at least seven different genes seemed to be involved in making the damage-control enzymes.

Their principal discovery is how few human genes there seem to be.

On the other hand, 30 genes classified into the first cluster seem to have a change in gene-expression levels.

Other genes of the innate immune system also seem to be subject to powerful positive selection.

Abnormal genes seem to lead to Parkinson's disease in some people.

At least four independent groups report that the new gene, called p16, seems to be playing a minor role, at best, in most cancers.

The principal surprise is how few human genes there seem to be compared with the estimate of 100,000 given in many textbooks.

To researchers, each gene initially seems like a piece of encrypted e-mail.

This gene seems to have a role in some forms of cancer.