Insulin biosynthesis of the healthy Beta cell
The illustration shows a (schematic) cut through a Beta cell and a capillary vessel with red blood cells (erythrocytes) and insulin- as well as blood sugar molecules. The Beta cells are in the islets of Langerhans (islet cells) of the pancreas. On the top: Synthesis of pre-proinsulin at the ribosome. On the bottom left: Chain structure of the insulin and the split-off c peptide in red.