Macrophage Activation SyndromeMastocytosisMast CellsMastocytosis, SystemicMastocytosis, CutaneousArthritis, JuvenileUrticaria PigmentosaLymphohistiocytosis, HemophagocyticSyndromeCell DegranulationTryptasesReceptors, IgEFerritinsMacrophage ActivationWater WellsProto-Oncogene Proteins c-kitChymasesImmunoglobulin Ep-Methoxy-N-methylphenethylamineAnaphylaxisLeukopeniaDopamine AgentsPassive Cutaneous AnaphylaxisAntigens, Differentiation, Myelomonocyticbeta-N-AcetylhexosaminidasesLeukemia, Mast-CellThioxanthenesThrombocytopeniaInternational CooperationStem Cell FactorFeverHypersensitivityMethylhistaminesCells, CulturedMice, Inbred C57BLHistamineKetotifenSerine EndopeptidasesLymphocyte ActivationPeritoneal CavityBone Marrow CellsMice, KnockoutAnti-Allergic AgentsSignal TransductionLeukotriene C4CytokinesLeukotriene E4Receptor AggregationMacrophagesAntigens, CD98 Light ChainsMice, Inbred BALB CBone MarrowMastocytomaTransition ElementsLeukotrienesAngelicaTrichinella spiralisSkinProstaglandin D2