Perform a multiple sequence alignment using the MUSCLE tool (see http://www.drive5.com/muscle/). The EBI's WSMuscle web service (see http://www.ebi.ac.uk/Tools/webservices/services/muscle) is used. Note: the WSMuscle service used by this workflow is deprecated as of 21st September 2010 and should not be used in any new development. This service is will be retired during 2011. EBI's replacement MUSCLE services (REST or SOAP) should be used instead.