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Glossary Term
Glossary Term Boolean
Definition Refers to an expression that must evaluate to a value of true or false, named for the British mathematician George Boole. In MGI and other databases, Boolean refers to the kind of logical relationship among search terms. Boolean operators include AND, OR, and NOT. For example, searching for all markers of the type "Gene" on Chromosome 2 is equivalent to identifying the union of the two sets:
  1. all markers of the type "Gene" (Type Gene?=true) AND
  2. all markers on Chromosome 2 (Chromosome 2=true).

Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB), Gene Ontology (GO)
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last database update
MGI 6.19
The Jackson Laboratory