The absence of sperm. Sterility in males.

The crime of intentionally setting fire to buildings and other property.

A substance, usually a protein, that stimulates the body to produce antibodies against it.

A protein that destroys or inactivates a specific antigen. Antibodies are found in the blood serum.

The science of the origin, culture, and development of humans. This can come into play when identifying skeletal remains, certain foodstuffs or items of clothing.

Any of several alternative forms of a gene located at the same point on a particular pair of chromosomes. For example, the genes determining blood types A and B are alleles.

A waxy, soap-like substance formed during the decomposition of bodies buried in moist places. It consists principally of insoluble salts of fatty acids. Also called “grave wax.” Composed of oleic, palmitic, and stearic acids.

The use of physical evidence to build a theoretical model of a given crime or accident scene.

A substance that is used to create and sometimes direct the spread of a fire. The most commonly used liquid accelerants include gasoline, lighter fluid, kerosene, and turpentine. See Gas Chromatography for information on how accelerants are identified.