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.
Virginia: Small towns, beaches and bright lights. Northern Virginia revolves around the big city hustle of Washington D.C. while southern Virginia is full of small towns, farms, beaches, and historic places. Relocation opportunities to Virginia greatly differ in the southern and northern parts of the state.