Mast cell progenitors express transcripts of the receptors for IL-3, IL-5, EPO, and IL-33. The graphs show gene expression levels of the indicated cytokine receptors. (A) UMAP visualization of Lin⁻ c-Kit⁺ cells (data set 1). (B) UMAP visualization of Lin⁻ CD34⁺ c-Kit⁺ cells (data set 2). Ery, erythroid; MPP, multipotent progenitor; Neu, neutrophil; Pop A, population A.