Insulin the simplest unicellular eukaryotes. Apart from animals, insulin-like proteins are also known to exist in the Fungi and Protista kingdoms. Insulin is produced by beta cells of the pancreatic islets in most vertebrates and by the Brockmann body in some teleost fish. Cone snails "Conus geographus" and "Conus tulipa", venomous sea snails that hunt small fish, use modified forms of insulin in their venom cocktails. The insulin toxin, closer in structure to fishes' than to snails' native insulin, slows down the prey fishes by lowering their blood glucose levels. The preproinsulin precursor of insulin is encoded by the "INS" gene.
Insulin pen pen systems: durable and prefilled: Most brands of insulin are now available for use in pens, these include: Insulin pens are used by 95% of insulin-treated patients in Europe, Asia, Australia and Scandinavia with excellent results. They are currently underutilized but growing in use in the United States. Insulin pens offer several significant advantages over insulin syringes: ease of handling, accuracy, and they are more discreet to use and easier to transport. Insulin pens have a number of advantages: It is important that proper injection sites on the body be used. A healthcare provider helps determine the best injection site