Frederick Banting upon the idea of obtaining insulin from the fetal pancreas. He removed the pancreases from fetal calves at a William Davies slaughterhouse and found the extracts to be just as potent as those extracted from the dog pancreases. By December 1921, he had also succeeded in extracting insulin from the adult pancreas. Pork and beef would remain the primary commercial sources of insulin until they were replaced by genetically-engineered bacteria in the late 20th century. In spring of 1922, Banting established a private practice in Toronto and began to treat diabetic patients. His first American patient was Elizabeth Hughes Gossett,
Banting (crater) a large patch of lunar mare. Maria like Mare Serenitatis are dark, smooth areas created by lava pooling on the surface and then cooling, covering up any previously existing craters. They were originally called "maria" ("seas") because astronomers believed they were bodies of water. Banting is flanked by two U.S. lunar landing sites – those of Apollo 15 and 17 – which lie several hundred miles on either side of the crater. Mare Serenitatis is frequently perceived to be the eastern eye of the Man in the Moon. The Man in the Moon is on the near side of the