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.
Driftwood on the shore of the peaceful bayou Stock Photo. sunrise over the Bayou clean. NICEVILLE, USA - JULY 21, 2013: people enjoy the beautiful beach at Niceville, USA. The adjacent cities of Niceville and Valparaiso, both built around Boggy Bayou, are known as the Twin Cities.