Histological sections of the pancreatic nodules with immunoreactivity to the pancreatic hormones of Atlantic wolffish. (A) Insulin (green) and IAPP (red) in the endocrine tissue. (B) Glucagon (green) and IAPP (red) in the endocrine tissue. (C) Chromogranin A surrounding the endocrine nodules. (D) The exocrine nodule with immunoreactivity to chromogranin A was isolated from an Atlantic wolffish.