genome chm1_cens_v21 trackDb chm1_cens_v21/trackDb.txt groups chm1_cens_v21/groups.txt description CHM1 centromere assemblies v21 by Glennis Logsdon twoBitPath chm1_cens_v21/chm1_cens_v21.2bit organism Human defaultPos chm1_cen5v2:28250000-34600000 scientificName Homo sapiens