Expression of BMPRIA in NK cell precursors from human lymph nodes. Lymph node mononuclear cells were used to analyze BMPRIA expression on stage 1-4 NK cell precursors. (A) Dot plot shows the expression of CD34 and CD117 in Lin⁻ (CD3⁻, CD19⁻, CD14⁻, CD94⁻) cells. Histograms show BMPRIA expression on stage 1 CD34⁺ CD117⁻ CD94⁻pro-NK cells, stage 2 CD34⁺ CD117⁺ CD94⁻ pre-NK cells and stage 3 CD34⁻ CD117⁺ CD94⁻committed immature NK cells. The percentages of positive cells are indicated in each histogram. (B) Dot plot shows the expression of CD117 and CD94 in Lin⁻ (CD3⁻, CD19⁻, CD14⁻, CD34⁻) cells. Histograms show BMPRIA expression on stage 3 CD34⁻ CD117⁺ CD94⁻immature NK cells and stage 4 CD34⁻ CD117^+/− CD94⁺ NK cells. The percentages of positive cells are indicated in each histogram. Data are representative of 3 independent experiments.