Exploration, however, of the top-35 positions for which DNA methylation tends to be related to serum folate levels showed a probe (cg24973150, p = 5.15E-05) located within a CpG island in the promoter region (TSS200) of the HOXB7 gene, which has been recently associated with the risk of neural tube defects [31]. Here, HOXB7 is linked to neural tube defect.