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The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories ( For more information about these ontologies, see the MGI Publications Page at

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Accession:MP:0010050 term browser browse the term
Definition:increased myelin formation in a myelin sheath over all or part of an axon or fiber tract, usually resulting in a thicker myelin sheath
Synonyms:exact_synonym: increased myelination

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  mammalian phenotype 0
    nervous system phenotype 0
      abnormal nervous system physiology 0
        abnormal myelination 0
          hypermyelination 0
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