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.
Had a great time renting one of the fine cabins at Osage Hills State Park over Christmas break. Clean, comfortable and wonderful staff. The Best Park In Northeastern Okla.!!! The grounds were clean, the rangers very friendly and helpful, the restrooms and showers clean, and we felt safe.