What Human Assembly and Coordinate System is Ensembl Using?
Ensembl uses the most recently updated human genome housed at the GRC. This is called GRCh37. NCBI and UCSC use the same genome. (UCSC refers to the recent human genome as GRCh37/hg19 http://genome.ucsc.edu/cgi-bin/hgTracks?org=human). If you are looking for an older genome, try the Ensembl archive sites. The previous human assembly NCBI36 is the same as UCSC’s hg18. Updates to GRCh37 will be incorporated as “patches”. Find more information about human patches and haplotypes here.