"Short-sellers are piling into biotech stocks like Savient Pharmaceuticals(SVNT) and Avanir Pharmaceuticals(AVNR) emboldened by a sour economy and the challenge of selling new drugs in an uncertain environment of health care reform and high drug prices. "

Needless to say,MannKind is one of them.

http://topstockstoinvest.blogspot.com/2012/09/10-most-shorted-stocks-in-biotech.html