MX1 and myelodysplastic syndrome: To assess the role of miR‐126 in the MDS pathogenesis, we then generated NHD13/miR126 KO animals (NHD13/miR‐126f/f/Mx1‐Cre) by crossing conditional miR‐126f/f/Mx1‐Cre (miR‐126 KO) mice with NHD13 mice (Figure 2A).