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.
Poised on the hillside of the beautiful campus of Davis & Elkins College, Elkins, WV, Graceland Inn and the adjacent Byrd Center command a twenty-mile view of the scenic mountains and some of the best outdoor activities in the east.