Healthy adult bone marrow Erythroid cells also differ from the tumor-induced Erythroid cells [6, 18], as they do not express any PDCD1 (PD-1) or CD274 (PD-L1) genes, which suggests restricted immunosuppression by healthy adult bone marrow Erythroid cells compared with the tumor-induced ones. Here, PDCD1 is linked to neoplasm.