Biotechnology In connection with a qui tam proceeding ("whistleblower case"), Swiss biotech firm Actelion previously announced in September 2010 that its fully owned US subsidiary Actelion Pharmaceuticals US received a subpoena from the US Attorney's Office for the Northern District of California relating, among other things, to the marketing and sales practices of its leading pulmonary arterial hypertension drug Tracleer (bosentan) in the USA. 10 January 2014