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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Reduced bone-marrow pro-B cell count
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Accession:HP:0020048 term browser browse the term
Definition:A reduction in the numbers of pro-B cells (defined by coexpression of CD34 and CD19). Earlier B-cell precursors are defined by expressing surface CD34 and cytoplasmic TdT in the absence of CD19.

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of blood and blood-forming tissues 0
        Abnormality of bone marrow cell morphology 0
          Reduced bone-marrow pro-B cell count 0
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