LiftOver & ReMap Track Settings
UCSC LiftOver and NCBI ReMap: Genome alignments to convert annotations to hg19   (All Mapping and Sequencing tracks)

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 UCSC liftOver to hg19  UCSC liftOver alignments to hg19   Data format 
 NCBI ReMap hg19  NCBI ReMap alignments to hg19/GRCh37   Data format 
 ReMap + axtChain hg19  NCBI ReMap alignments to hg19/GRCh37, joined by axtChain   Data format 
Related tracks
  • GRC Incident: GRC Incident database, to explore reasons why the assembly was changed
  • ReMap ChIP-seq: ReMap, even though it has the same name, is a database of transcription factor binding sites, unrelated to NCBI ReMap


This track shows alignments from the hg38 to the hg19 genome assembly, used by the UCSC liftOver tool and NCBI's ReMap service, respectively.

Display Conventions and Configuration

The track has three subtracks, one for UCSC and two for NCBI alignments.

The alignments are shown as "chains" of alignable regions. The display is similar to the other chain tracks, see our chain display documentation for more information.

Data access

UCSC liftOver chain files for hg19 to hg38 can be obtained from a dedicated directory on our Download server. The NCBI chain file can be obtained from the MySQL tables directory on our download server, the filename is 'chainHg19ReMap.txt.gz'.

Both tables can also be explored interactively with the Table Browser or the Data Integrator.


ReMap 2.2 alignments were downloaded from the NCBI FTP site and converted with the UCSC kent command line tools. The UCSC tool chainSwap was used to swap target and query genome to show the mappings on the hg38 genome. Like all data processing for the genome browser, the procedure is documented in our hg19 makeDoc file.


Thanks to NCBI for making the ReMap data available and to Angie Hinrichs for the file conversion.