Not all host cells will take up the foreign genes.

The foreign gene is not intended to have any effect on the patient's cancer.

The foreign genes are expected to help doctors monitor the effectiveness of the cancer treatment.

In about a quarter of cases the foreign genes have appeared in the next generation.

The plants carry foreign genes taken from the viruses that confer protection against the disease.

The cells take up the virus and thus acquire the foreign gene.

This will lead to an influx of foreign genes in the parent population, a situation called an introgression.

Sometimes plants accept foreign genes with a little help from plant geneticists.

The first effort to insert foreign genes into human patients has succeeded on every possible front, researchers say in a new report.

The first was to get the foreign genes into the animals.