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Hematoxylin and eosin (HE) staining. HE of pancreatic tissue from STZ rats treated with O2 seven days post STZ and 14 days post STZ. Pancreatic tissue damage was present at seven days and maximal at 14 days. Ozone treatment showed restoration of normal cellular population size of islets of Langerhans and absence of islet damage. STZ + O2 = oxygen-treated STZ rats; STZ + O3 = oxygen/ozone-treated STZ rats. Scale bar = 50 µm.
