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A knockout mouse is a laboratory mouse in which researchers have inactivated, or "knocked out," an existing gene by replacing it or disrupting it with an artificial piece of DNA.

A genome-wide association study is an approach that involves rapidly scanning markers across the complete sets of DNA, or genomes, of many people to find genetic variations associated with a particular disease.

Deoxyribonucleic acid (DNA) is a molecule which contains the biological instructions that make each species unique. DNA, along with the instructions it contains, is passed from adult organisms to their offspring during reproduction.

Cloning describes a number of different processes that can be used to produce genetically identical copies of a biological entity. The copied material, which has the same genetic makeup as the original, is referred to as a clone.

Chromosomes are thread-like structures located inside the nucleus of animal and plant cells.

Adult Data Fact Sheets.

Health Effects Fact Sheets.

Cessation Fact Sheets.

Secondhand smoke contains more than 7000 chemicals. Hundreds are toxic and about 70 can cause cancer.