Frederick Banting realized that this procedure would destroy the trypsin-secreting cells but not the insulin. Once the trypsin-secreting cells had died, insulin could be extracted from the islets of Langerhans. Banting discussed this approach with J. J. R. Macleod, Professor of Physiology at the University of Toronto. Macleod provided experimental facilities and the assistance of one of his students, Charles Best. Banting and Best, with the assistance of biochemist James Collip, began the production of insulin by this means. As the experiments proceeded, the required quantities could no longer be obtained by performing surgery on living dogs. In November 1921, Banting hit
Banting (crater) name the small craters around it with the same name followed by different letters of the alphabet. The new policy allowed deceased scientists who had contributed to biological knowledge, like Dr. Banting – as well as scientists from other fields and contributors to culture and knowledge, such as writers, composers, and artists – to have craters named after them. Previously, only the names of astronomers, others who had made important contributions to astronomy, and historical philosophers had been used. Banting is a "simple" impact crater. It is located in the Sea of Serenity, which is also known as Mare Serenitatis,