SplenomegalyHepatomegalySplenectomyPrimary MyelofibrosisSpleenSplenic NeoplasmsHypersplenismLymphatic DiseasesSplenic DiseasesMurine Acquired Immunodeficiency SyndromeThrombocytopeniaMyeloproliferative DisordersTropical MedicineBone MarrowSkin Diseases, EczematousLeukemia, ProlymphocyticHypertension, PortalLeukemia, ExperimentalAnemiaFriend murine leukemia virusHematopoiesis, ExtramedullaryLeukocytosisAutoimmune Lymphoproliferative SyndromeSplenic VeinLymphoproliferative DisordersLymphocytosisLeukemia, Hairy CellHistiocytic SarcomaPolycythemia VeraLymphohistiocytosis, HemophagocyticProguanilThrombocytosisPancytopeniaMice, Inbred C57BLAnemia, HemolyticJanus Kinase 2Organ SizeGraft vs Host ReactionGammaherpesvirinaeGaucher DiseaseReticulinHypergammaglobulinemiaTherapies, InvestigationalLeishmaniasis, VisceralLeukemia, Neutrophilic, ChronicHematologic DiseasesMalariaB-LymphocytesBlood Cell Count