title: Studies on the A1-cells in the endocrine pancreas of some cartilaginous fishes.
mesh_terms: D000818:Animals; D003594:Cytoplasmic Granules; D005399:Fishes / Q000033:anatomy & histology*; D007515:Islets of Langerhans / Q000166:cytology*; D013194:Staining and Labeling