This tissue, which makes new blood cells, would be implanted with the viral genes.

The new bone marrow would produce blood cells that carry the extra viral genes.

But those few viral genes have been showing up in surprising ways along the human gene sequence.

Outside a cell, viral genes cannot reproduce; they just don't have all the equipment.

So far the indication is that all the viral genes are of avian origin.

His research team looked at 21 American multiple sclerosis patients and found traces of the viral genes in blood cells from 6.

These are usually derived from viral genes, which explain their high immunoreactivity.

Reverse genetics is a powerful tool to study and characterize the previously unknown viral genes.

This is accompanied by the continual expression from a number of viral genes.

With the complete molecule at hand, he found that it no longer blocked the viral gene.