The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories (ftp://ftp.informatics.jax.org/pub/reports/index.html). For more information about these ontologies, see the MGI Publications Page at http://www.informatics.jax.org/mgihome/other/publications.shtml.
reduced number of resting mature B cells with distinct phenotypic characteristics (CD23-positive, CD21-positive) found typically in the B cell follicle region of the spleen and lymph nodes