Starting with the August 2001 freeze, this track is based on tiling path (TPF) maps curated by the sequencing centers responsible for each chromosome. Imre Vastrik at the European Bioinformatics Institute merges the TPF maps with the FPC map, favoring the TPF map where there are conflicts. This step increases the clone coverage substantially over that in the TPF maps. This merged map is then used as the basis for the human genome assembly. The clone contigs in this merged map are shown in this track.