NCBI Entrez Utilities Web service set provides access to EGQuery, ESummary, EInfo, ELink, ESearch, ESpell, EPost and EFetch utilities. Services' descriptions can be found at the NCBI's Web site at: http://www.ncbi.nlm.nih.gov/entrez/query/static/esoap_help.html You can add this set of services to the list of available services in the Service Panel in the Taverna Workbench by right clicking on "Available Services" and selecting "Import services". The service set can eith...