Many genes are probably involved, each to a small degree.

Now, scientists hope to understand regeneration by finding the genes involved.

We're not going to be able to sort this out until we've identified all the genes involved.

It is likely that many genes are involved, each of small effect and unknown transmission and expression.

Other genes involve the more common late-onset Alzheimer's in patients 60 years and older, and affect the ability to clear the beta-amyloid from the brain.

Much other gene therapy research has involved use of specially modified viruses to transplant genes in the laboratory.

These genes involve maintaining the genome and avoiding destruction of the host cell.

Certain horse breeds appear to be more predisposed to the condition than others, but research has yet to identify the genes involved.

Experts suspect that more than 20 genes could be involved, each underlying a different aspect of autism.

Understanding the genes involved may help to target medical treatment to individuals with Down syndrome.