The data files ("UCSC Chain Files") in this directory are property of The
Regents of the University of California, and made available free for
non-commercial use by Independent Researchers and Nonprofit Organizations. Any
other use of UCSC Chain Files requires a commercial license, for which users
should contact As used herein, "Independent
Researcher" means an individual who is autonomous with respect to the
research activities for which he or she uses the UCSC Chain Files (note: such
use does not extend to any use of the UCSC Chain Files at the direction and/or
for the benefit of a for-profit organization); and "Nonprofit
Organization" means a university or other institution of higher education,
or a not-for-profit organization officially recognized or qualified under the
laws of the country in which it is organized or located, or any nonprofit
scientific or educational organization qualified under a federal, state or local
jurisdiction's nonprofit organization statute. Downloading or using UCSC Chain
Files indicates your acceptance of the End User License Agreement (EULA) posted
at ""; redistribution of UCSC Chain
Files by you must include this README file with these license restrictions, in
the same archive or directory with the chain files.

This directory contains the data files required as input to 
the liftOver utility. This tool -- which requires a Linux 
platform -- allows the mass conversion of coordinates from 
one assembly to another. The executable file for the utility can 
be downloaded from

The file names reflect the assembly conversion data contained within
in the format <db1>To<db2>.over.chain.gz. For example, a file named file contains the liftOver data needed to convert hg15 
(Human Build 33) coordinates to hg16 (Human Build 34). If no file is 
available for the assembly in which you're interested, please send a 
request to the genome mailing list ( and we will 
attempt to provide you with one.

To download a large file or multiple files from this directory, 
we recommend that you use ftp rather than downloading the files via our 
website. To do so, ftp to, then go to the 
appropriate goldenPath/<assembly>/liftOver directory. To download multiple 
files, use the "mget" command:

    mget <filename1> <filename2> ...
    - or -
    mget -a (to download all the files in the directory)

Please refer to the credits page 
( for guidelines and
restrictions regarding data use for these assemblies. 

      Name                           Last modified      Size  Description
Parent Directory - md5sum.txt 2021-10-12 19:33 1.3K rheMac2ToCalJac1.over.chain.gz 2007-11-17 21:05 59M rheMac2ToCalJac3.over.chain.gz 2010-02-11 18:31 48M rheMac2ToGorGor3.over.chain.gz 2011-10-22 17:48 32M rheMac2ToHg17.over.chain.gz 2006-03-22 11:41 36M rheMac2ToHg18.over.chain.gz 2006-02-03 10:13 37M rheMac2ToHg19.over.chain.gz 2009-06-02 11:20 33M rheMac2ToHg38.over.chain.gz 2014-07-12 18:48 33M rheMac2ToMacFas5.over.chain.gz 2021-10-12 18:35 5.6M rheMac2ToMm8.over.chain.gz 2006-02-20 22:22 64M rheMac2ToMm9.over.chain.gz 2007-09-07 10:41 86M rheMac2ToMonDom5.over.chain.gz 2009-03-02 22:39 23M rheMac2ToPanTro2.over.chain.gz 2006-03-30 15:04 37M rheMac2ToPanTro3.over.chain.gz 2011-03-07 09:51 33M rheMac2ToPapAnu2.over.chain.gz 2014-12-12 02:37 14M rheMac2ToPonAbe2.over.chain.gz 2007-11-18 03:43 39M rheMac2ToRheMac3.over.chain.gz 2012-07-24 16:14 26M rheMac2ToRheMac8.over.chain.gz 2016-02-06 14:00 3.7M rheMac2ToRn4.over.chain.gz 2006-03-23 09:16 77M