In prostate cancer, the cells of these prostate glands mutate into cancer cells.

This occurs because the virus can mutate over time when exposed to medication.

And experts worry that the novel H1N1 virus could mutate into a more severe strain.

You know, we mutate during four billion years before, but now, because it's me, we stop. Fin.

It is very hard to develop vaccines for viruses that mutate constantly such as influenza or HIV.

On the contrary, it is only when these viruses enter a high density poultry operation that they mutate into something far more virulent.

Cancer cells mutate and they gain the ability to release lots of those angiogenic factors, natural fertilizer, that tip the balance in favor of blood vessels invading the cancer.

The most effective cancer vaccine is likely to raise an immune response against a broad range of tumor antigens to minimise the chance of the tumor being able to mutate and become resistant to the therapy.

Yet another area of regional and global concern was the spread of avian influenza, especially the real possibility that the virus might mutate at some point into a form capable of human to human transmission, leading to a possible pandemic.