DHCR7 and myeloid sarcoma: To further assess the effect of the independent vitamin D pathways on the risk of MS, we analyzed SNPs near genes implicated in 25OHD synthesis (DHCR7 and CYP2R1) and metabolism (GC and CYP24A1) separately and found that both strongly associated with increased risk of MS (Table 4; S5 and S6 Figs).