_:b668239577 . _:b668239577 . _:b668239577 "Measurement of a lesion involving one or more pancreatic islets, i.e. islets of Langerhans, the endocrine, hormone-producing portion of the pancreas. A lesion is a localized pathological change in structure of an organ or tissue due to injury or disease; especially one that is circumscribed and well defined."^^ . _:b668239577 "ISBN:978-1416049982"^^ . _:b668239577 . _:b668239577 "Dorland:Dorlands_Illustrated_Medical_Dictionary--31st_Ed"^^ . _:b668239577 .