Inclusion: In forensic and paternity testing the situation that exists when testing has demonstrated that a particular individual belongs to the group of individuals who could be the source of the sample or in a paternity case the father of the child. They have not been excluded.

Indirect Exclusion: A presumed exclusion based on the observation that the child and AF are homozygous for different alleles. It is possible that the child and AF actually share a null gene that is not detected. An indirect exclusion is not considered 100% conclusive, and usually before an opinion of nonpaternity can be rendered, a search is made for a second direct or indirect exclusion.

Infant: A person who has not reached legal majority, usually 18 years of age. Also, referred to as a "minor," or unemancipated child.

Isotope: The radioactive form of an atom known as a radioisotope.