No specific gene has been found to be associated with the disorder.

By 1990 nearly all specific genes and enzymes had been identified.

"As a result, they show many differences from other populations in their frequency of specific genes."

Even without knowing the nature of the specific genes, the process can still be used.

It is therefore possible to control the expression of a specific gene.

In most cases, the specific genes responsible are still to be discovered.

Learning about specific genes could also lead to better treatments.

Researchers continue to search for the specific gene associated with this form of the condition.

Or can the genome be changed by any specific gene?

This is not definitive, however, and no specific gene has been named.