Among the 29 positively correlated genes listed in Supplemental Table 20, we found that two genes, period circadian clock 1 [PER1, also known as microRNA 6883 (MIR6883)] and FK506 binding protein 5 (FKBP5) were up-regulated in MS peripheral blood, significantly (P < 0.01, Supplemental Table 21). Here, PER1 is linked to myeloid sarcoma.