track CD4_hg18 type bigBed 3 bigDataUrl CD4_hg18.bigBed shortLabel CD4_CTCF longLabel CTCF binding sites in CD4 cells track HeLa_hg18 type bigBed 3 bigDataUrl HeLa_hg18.bigBed shortLabel HeLa_CTCF longLabel CTCF binding sites in HeLa cells