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Glossary Term
Glossary Term X Inactivation
Definition The condensation of all but one of the X chromosomes of a mammal into a heterochromatic state, eliminating gene expression from all but the active X chromosome. This process ensures that male and female mammals have the same level of gene activity of X-chromosome genes.

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 6.20
The Jackson Laboratory