https://snpinfo.niehs.nih.gov/ucscview/korach/sylvia/HiC_Sept2018/E2-1h.None.50k.btr
https://snpinfo.niehs.nih.gov/ucscview/korach/sylvia/HiC_Sept2018/P4-1h.None.50k.btr
https://snpinfo.niehs.nih.gov/ucscview/korach/sylvia/HiC_Sept2018/V.None.50k.btr