PHAROS is a user interface to the so-called Knowledge Management Center of the Illuminating the Druggable Genome (IDG) initiative, which aims to explore the properties and biological functions of the whole potentially druggable human proteome. In this way, a total of 1019 proteins (out of the 1047 human proteins above described) were found with annotations in this system. PHAROS classifies proteins in four groups as regarding their drug development level: "Tclin", which are proteins with at least one approved drug, and therefore well validated as therapeutic targets; "Tchem", which are proteins with at least one known modulating small molecule; "Tbio", proteins characterized to some extent biologically but with not known modulating small molecule; and "Tdark", which are proteins about which little knowledge is available, in terms of biological function, structure, and involvement in disease. In our list of 1019 human proteins, 60% are in the "Tchem" group, 31% in the "Tclin", and 9% in the "Tbio" groups. It is possible to see that, within the "Tclin" group, "7TM1" and "Oxidoreductase" are the most abundant ones. As regarding the "Tchem" group, the classes with the largest numbers of proteins are "Protease", ""7TM1", "Other", and "Enzyme other". Finally, the "Tbio" group has "Other", "Transferase", and "Enzyme other" as the most populated target classes.