Business, News XL-Protein and Easton Pharmaceutical Sign License Agreement to Develop Biopharmaceuticals Using PASylation® Technology by Business Wire • 2015/12/17 • 0 Comments FREISING, Germany & CHENGDU, China--(BUSINESS WIRE)--XL-protein and Easton Pharmaceutical Sign License Agreement to Develop Biopharmaceuticals Using PASylation® Technology