The ENCODE project proposes to map all of the DHSs in the human genome with the intention of cataloging human regulatory DNA.
DHSs mark transcriptionally active regions of the genome, where there will be cellular selectivity.  So, they used 125 different human cell types.  This way, using the massive sequencing technique, they obtained the DHSs profiles of every cellular type.  Through an analysis of the data, they identified almost 2.9 million distinct DHSs.  34% were specific to each cell type, and only a small minority (3,692) were detected in all cell types.  Also, it was confirmed that only 5% of DHSs were found in TSS (Transcriptional Start Site) regions.  The remaining 95% represented distal DHSs, divided in a uniform way between intronic and intergenic regions.  The data gives an idea of the great complexity regulating the genetic expression in the human genome and the quantity of elements that control this regulation.
The high-resolution mapping of DHSs in the model plant Arabidopsis thaliana has been reported. Total 38,290 and 41,193 DHSs in leaf and flower tissues have been identified, respectively.