Based on these features, MSC and EC could also be identified with the EuroFlow BCP-ALL MRD antibody panel based on high expression of both CD81 and CD73 in the absence of CD45 and other hematopoietic cell associated markers (CD19, CD66c, CD123, CD38, and CD20) (Figure 1). This evidence concerns the gene CD81 and acute lymphoblastic leukemia.