They replaced genes in the Choz biosystem, but they had to work harder for it.

Gene therapy involves putting genes into cells in the body, often to replace native genes that are malfunctioning.

Enter gene therapy, which works by replacing flawed genes with fully functional genes.

There is also a risk that replaced abnormal genes of the germ-line cells will damage other parts of the genetic apparatus.

Disease, it should be remembered, even hereditary disease, does not always have to be treated by replacing genes.

Viagene aims to treat diseases like cystic fibrosis by replacing deficient genes in the body.

Gene therapy is the genetic engineering of humans by replacing defective human genes with functional copies.

The initial goal was simple: to cure, or prevent, these illnesses by replacing defective genes with healthy ones.

The Cell Genesys scientists are replacing certain genes in mouse chromosomes with new genetic information.

It seemed criminal to replace healthy genes with sick ones, even if the old humans would regard it as a restoration of normality.