genome chm1_cens_v18 trackDb chm1_cens_v18/trackDb.txt groups chm1_cens_v18/groups.txt description CHM1 centromere assemblies v18 by Glennis Logsdon twoBitPath chm1_cens_v18/chm1_cens_v18.2bit organism Human defaultPos chm1_cen5v2:28250000-34600000 scientificName Homo sapiens