Effective in 2003, the Bureaus of Alcohol, Tobacco and Firearms (ATF), Federal Law Enforcement Training Center (FLETC), U.S. Customs, and the United States Secret Service (USSS) are no longer Bureaus of the Department of the Treasury.
The endocrine system is made up of a network of glands. These glands secrete hormones to regulate many bodily functions, including growth and metabolism. Endocrine diseases are common and usually occur when glands produce an incorrect amount of hormones.
The endocrine cell subsets are: 1  Alpha cells that produce glucagon, and make up 15â20% of total islet cells. 2  Beta cells that produce insulin and amylin, and make up 65â80% of the total islet cells. 3  Delta cells that produce somatostatin, and make up 3â10% of the total islet cells.