It can also invoke R statistical services, local Java code, external tools on remote machines (via ssh), do XPath and other text manipulation, import a spreadsheet and include sub-workflows.
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Taverna allows users to integrate many different software components, including SOAP or REST Web services, such as those provided by the National Center for Biotechnology Information, the European Bioinformatics Institute, the DNA Databank of Japan (DDBJ), SoapLab, BioMOBY and EMBOSS.