Human cell GRO-cap data (K562 and GM12878), together with GRO-seq and PRO-seq datasets, produced for the paper Analysis of nascent RNA identifies a unified architecture of initiation regions at mammalian promoters and enhancers (doi: 10.1038/ng.3142) is available as a loadable track hub for the UCSC Genome Browser using the following URL:
http://compgen.cshl.edu/GROcap/hub.txt
To use enter the URL in the "Track Data Hubs" page, "My Hubs" tab (accessible through the "track hubs" button) in the UCSC Genome Browser (see Viewing Track Hubs in the Browser for further details). Or follow this link: http://genome.ucsc.edu/cgi-bin/hgTracks?db=hg19&hubUrl=http://compgen.cshl.edu/GROcap/hub.txt