Final answer:
Amino acids are stored in the muscles and other tissues in the body. The liver is also involved in amino acid metabolism and can store amino acids for later use.
Step-by-step explanation:
Amino acids are stored in the body in various tissues, but one of the main storage sites is in the muscles. When amino acids are not immediately needed for protein synthesis they can be stored in the form of muscle protein or as free amino acids in a pool within the cells.