EXHIBIT 10.20 Amended and Restated Human Glucagon, Analogues of Human Glucagon, Analogs of Human Insulin Letter Agreement WHEREAS, ZGI, formerly an indirectly wholly owned subsidiary of NN, is engaged generally in the research and development of...Human Glucagon, Analogues of Human Glucagon, Analogs of Human Insulin Letter Agreement • September 10th, 2001 • Zymogenetics Inc
