 They were able to distinguish between two types of diabetes, Type I and Type II, which have significantly different mechanisms.With the success of the insulin RIA, Berson and Yalow extended their success to other hormones, such as corticotropin, gastrin, parathyroid hormone and growth hormone, making significant discoveries in their physiology along the way.in 1972, Berson died of a heart attack in Atlantic City while attending a FASEB meeting.