Novolin R (Regular Human Insulin Injection [Recombinant DNA origin] United States Pharmacopeia) is a polypeptide hormone structurally identical to native human insulin and is produced by recombinant DNA technology, utilizing Saccharomyces cerevisiae (baker's yeast) as the production organism. Novolin R has the empirical formula C257H383N65O77S6 and a molecular weight of 5808.