PTPRC and essential thrombocythemia: We did not observe significant receptor levels on the surface of peripheral blood mononuclear cells (PBMCs) or CD45+TCRαβ+ T cells from healthy donors, primary AML patient blasts, or human AML cell lines (MV4-11, MOLM-13, OCI-AML3, HEL), an essential thrombocythemia (ET) cell line (SET-2), or a CML cell line (K562) (Fig. 1c, supplementary Fig. 2).