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.
Fairmont is a city in Marion County, West Virginia, United States. Nicknamed The Friendly City. The population was 19,097 at the 2000 census. It is the county seat of Marion County. Fairmont is located at 39Â°28â²53â³N 80Â°8â²36â³W / 39.48139Â°N 80.14333Â°W / 39.48139; -80.14333 (39.481253, -80.143453). The Tygart Valley River and the West Fork River join in Fairmont to form the Monongahela River.