B2M and myelodysplastic syndrome: To understand the functional relevance of the “don’t eat-me” signal in the mammalian system, we treated myelodysplastic syndrome 1 (Mds1)-GFP+/Flt3Cre (MFG) stem cell reporter mice (51) with DL-PPMP as it promoted the presentation of B2M, but not other “don’t eat-me” molecules, such as CD47 (fig.