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,
Highest and best use be a parkland valuation, where the appraiser has been instructed to ignore all other possible uses. Further, the highest and best use of a property can be a class of uses (such as retail or multi family), rather than a specific use (i.e. development of a fast food restaurant). In order to determine the maximum potential of a property Land Use developers often have to embark on a three-step analysis involving property analysis, entitlement and constraint analysis, and market analysis. In order to be considered as the highest and best use of a property however, any potential use must pass