Importantly, ARTN is secreted by CD71+ erythroid cells (CECs),8,24 which expand during stress hematopoiesis25,26,27 and have been observed in the peripheral blood both during acute SARS-CoV-2 infection28,29 and in LC patients with ME/CFS.8 This evidence concerns the gene ARTN and myalgic encephalomeyelitis/chronic fatigue syndrome.