The key elements of an amino acid are carbon, hydrogen, oxygen, and nitrogen, though other elements are found in the side-chains of certain amino acids. About 500 amino acids are known and can be classified in many ways.
Friendly is a town in Tyler County, West Virginia, in the United States.
The friendly Village of Moweaqua, Illinois, is located in the center of the state, along US 51, straddling the Christian/Shelby County Line, just south of the Macon County Line. Moweaqua is a growing and welcoming community of 2,000 friendly people with the traditional work ethic of midwestern small towns.