Cancer Glossary
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Vaccine: Modified disease virus used to stimulate resistance to that disease. Development of a cancer vaccine is currently a subject of intense research.

Vagina : Passage leading from the vulva to the uterus in women.

Vector: See cloning vector.

Virus: Noncellular biological entity that can reproduce only within a host cell. Viruses cause infections and are too small to be seen with regular microscopes. They consist of nucleic acid covered by protein; some animal viruses are also surrounded by membrane. Inside the infected cell, the virus uses the synthetic capability of the host to produce progeny ("children") virus.

VLSI: Very large scale integration allowing more than 100,000 transistors on a chip.