CD34 and acute myeloid leukemia: To root the AML tree, we use expression data of human embryonic stem cells (hESC); additionally, we include expression data of CD34+ hematopoietic cells from both peripheral blood (CD34 PB) and bone marrow (CD34 BM), human mesenchymal precursor cells (hESC MPC), as well as fully differentiated mononuclear cells from peripheral blood (PB) and bone marrow (BM).