Article: Viral chaff. (extra genes picked up from viruses)

PEOPLE can pick up new genes from viruses; viruses can pick up new genes from people. When an infected cell makes new copies of the virus that has invaded and enslaved it, it sometimes sends them out into the world with a few of the cell's own genes packed in, too. This will normally be a hindrance, but sometimes the extra genes can work to the virus's advantage.

When researchers first analysed the gene for the protein that picks up the tumour necrosis factor (TNF), one of the immune system's molecular messengers, they hurried to their databases to see if anyone else had seen anything like it. To their surprise, they found almost the same gene in a type of pox virus, ...

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