This track shows the locations of human contigs on the physical map. The underlying data is derived from the GRCh37 AGP file that accompanies this assembly. All contigs in this track are oriented to the "+" strand.
For human genome reference sequences dated April 2003 and later, the individual chromosome sequencing centers are responsible for preparing the assembly of their chromosomes in AGP format. (see also: AGP File Specification) The files provided by these centers are checked and validated at NCBI, and form the basis for the AGP file that defines the physical map contigs.
For more information on the human genome assembly process, see NCBI Assembly Primer.