<prompt> Sulfation factor isSomatostatinSomatomedianGIPVIP  <response>: Insulin-like growth factor 1 IGF-1, also called somatomedin C, is a protein that in humans is encoded by the IGF1 gene.IGF-1 has also been referred to as a sulfation factor and its effects were termed nonsuppressible insulin-like activity NSILA.Somatostatin also known as growth hormone-inhibiting hormone GHIH or somatotropin release-inhibiting factorSRIFGastric inhibitory polypeptideGIP Gastrin inhibitory peptide hormone is produced by the pancreas, that is secreted in response to oral- but not parenteral administration ofnutrients-eg, glucose and lipids. Vasoactive intestinal polypeptideVIP a polypeptide hormone secreted most commonly by non-b islet cell tumors of the pancreas; VIP increases the rate of glycogenolysis and stimulates pancreatic bicarbonate secretion; excess production causes copious watery diarrhea and fecal electrolyte loss, with hypokalemia and hypochlorhydria.Ref: Ganong;s review of medical physiology;24th edition; page no-327 