Glossary

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• Inferior Petrosal Sinus Sampling (IPSS): see Petrosal Sinus Sampling
• Insulin-Like Growth Factor-1 (IGF-1 or somatomedin-C): a hormone made in the liver which acts as the second messenger for growth hormone; its molecular structure is similar to insulin. This is the principal hormone that regulates growth and metabolism and is controlled by GH secretion by the pituitary gland. Learn more.