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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

Term:abnormal pre-B cell morphology
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Accession:MP:0002403 term browser browse the term
Definition:any structural anomaly of the cells in the B lymphocyte lineage that have undergone VDJ rearrangement of the immunoglobulin heavy chain and are in the process of V-J rearrangement of the light chain: these cells express mu heavy chain on the cell surface
Comment:These cells express the mu heavy chain in both the cytoplasm and on the cell surface; in addition to the mu heavy chain, other cell surface markers include CD45R, MHC class II, CD19, CD20, CD38, and CD40.

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  mammalian phenotype 5402
    hematopoietic system phenotype 250
      abnormal hematopoietic system morphology/development 230
        abnormal hematopoietic cell morphology 186
          abnormal leukocyte morphology 154
            abnormal mononuclear cell morphology 127
              abnormal lymphocyte morphology 99
                abnormal B cell morphology 29
                  abnormal pre-B cell morphology 0
                    decreased pre-B cell number + 0
                    increased pre-B cell number 0
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