Morphometric analysis of endocrine pancreas in old rats.
D000375:Aging; D000818:Animals; D002467:Cell Nucleus; D003238:Connective Tissue / Q000033:anatomy & histology; D003593:Cytoplasm; D007515:Islets of Langerhans / Q000033:anatomy & histology* / Q000166:cytology; D008297:Male; D009929:Organ Size; D051381:Rats