Web Service Hierarchy APIs  Get Full Hierarchy From TSN Description Returns the Taxonomic Hierarchy (i.e. the hierarchy from the kingdom to the requested scientific name) found by iteratively comparing the TSN to the Parent TSN field. Input A string containing the ITIS TSN. Output The resulting hierarchy as a list of string sets containing the TSN, taxonomic rank and scientific name, or an empty result set if there is no TSN match. Example http://www.itis.gov/ITISWebService/services/ITISService/getFullHierarchyFromTSN?tsn=1378  Get Hierarchy Down From TSN Description Returns a list of all the valid/accepted scientific names contained within a particular valid/accepted scientific name and their TSNs, limited to immediate children only. The result set will be found by comparing the search key to the parent TSN field. Note: There is the possibility that this could return a sizable set of data. For example, if searching with the TSN for Animalia (TSN 202423), the returned group would be all records in the Animalia tree. Because of this, this function will only return the immediate children of the search key (i.e. searching for Animalia's TSN would return the phyla directly linked to it, and the names of any other rank directly linked to it). Input A string containing the ITIS TSN. Output A set of strings containing the TSNs and the corresponding scientific names, or an empty result set if there is no TSN match or the scientific name is at the bottom of the hierarchy. Example http://www.itis.gov/ITISWebService/services/ITISService/getHierarchyDownFromTSN?tsn=202420  Get Hierarchy Up From TSN Description Returns the parent of the TSN (i.e. the parent of the current scientific name in the taxonomic hierarchy) found by comparing the search key to the ITIS TSN field. Input A string containing the ITIS TSN. Output A string containing the resulting TSN, or an empty result set if there is no TSN match or the scientific name is at the top of the hierarchy. Example http://www.itis.gov/ITISWebService/services/ITISService/getHierarchyUpFromTSN?tsn=1378