To our knowledge, expression of NG2 on peripheral blood and bone-marrow cells has not been reported before in mice, and NG2+ cells were only found in blood of patients with special types of leukemia [38, 42, 43], using a monoclonal antibody, MoAb 7.1, raised against an SV-40-transformed human marrow stromal cell line, which recognizes a 220–240 kDa protein with a high degree of homology to rat NG2 [43]. Here, CSPG4 is linked to leukemia.