Virology: Search for Essential Factors In Causes of Human Cancer

Researchers who are probing the mysteries of the relationship between viruses and human cancer may be tackling the most difficult job in all of medicine. It would be tough enough if their task involved whole viruses, most of which can not be seen and can be photographed only with the electron microscope. But cancer research must make even more minute explorations inside viruses; it must chart the behavior of molecules in a no man's land between the living and the nonliving.

A few elements in the mystery have been clarified, says ''Viruses and...

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