The regulated release of proinsulin from secretory granules accompanied by cleavage of proinsulin to form mature insulin. In vertebrates, insulin is secreted from B granules in the B cells of the vertebrate pancreas and from insulin-producing cells in insects. [ https://www.worldcat.org/search?q=bn%3A0198506732 GOC:mah ]

This is just here as a test because I lose it