Launched in Sweden in 2003, the Human Protein Atlas is an open-access database that was created to, "map all the human proteins in cells, tissues, and organs using integration of various omics technologies, including antibody-based imaging, mass spectrometry-based proteomics, transcriptomics and systems biology." This resource is intended to be used by researchers and educators in academia as well as in industry. Today, the Human Protein Atlas consists of three parts: the tissue atlas, the cell atlas, and the pathology atlas. Users can explore each atlas by conducting a free-text search while utilizing a number of controlled vocabulary fields. Additionally, users can browse by clicking on the tissue, cell, or pathology atlases.