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 lispro for postprandial glucose control. It has a shortened delay of onset, allowing slightly more flexibility than regular insulin, which requires a longer waiting period before starting a meal after injection. Both preparations should be coupled with a longer acting insulin (e.g. NPH insulin) or an insulin infusion pump for good glycemic control. Insulin lispro is an FDA approved drug used to treat people living with Type 1 diabetes or Type 2 diabetes. Insulin lispro has non-FDA labeled uses for diabetic neuropathy prevention and cardiovascular disease prevention. Common side effects include skin irritation at the site of injection, hypoglycemia, hypokalemia, and