Amylin Pharmaceuticals Inc.’s board dodged a dissident shareholder bullet three years ago, but the San Diego-based biotech is back in the crosshairs of billionaire investor and activist shareholder Carl Icahn, who again is seeking to nominate a new slate of board members to pull the trigger on a company sale. Given Icahn’s personal track record in the sector over the past few years – ImClone Systems Inc., MedImmune Inc. and Genzyme Corp. all landed acquisitions, though he was unsuccessful in facilitating a sale of Biogen Idec Inc. – Amylin’s days as an independent firm could be numbered. Certainly there are...