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Twenty to thirty-three percent of systemic mast cell disease (SMCD) patients have some degree of peripheral blood and/or bone marrow eosinophilia. While the clonality of SMCD was established by identification of the pathogenic c-kit Asp816 to Val (D816V) mutation in sorted cells of different hematopoietic lineages, this mutation has not previously been demonstrated in eosinophils from SMCD patients...