This track contains "true" TSS peaks produced by the FANTOM Consortium, and used in the CLS project to assess 5' completeness of transcript models. The BED files were downloaded from here and liftedOver to the current genome assembly.
See A promoter-level mammalian expression atlas, The FANTOM Consortium and the RIKEN PMI and CLST (DGT), Nature 507, 462–470 (2014) (doi:10.1038/nature13182) for more details.