Favorite Amino Acid

My favorite amino acid is phenylalanine, and the molecular machine I am relating it too is phenylalanine hydroxylase. I picked phenylalanine because of the detrimental effect it can have on the body if the body cannot produce the enzyme phenylalanine hydroxylase. If the enzyme doesnt break phenylalanine down into tyrosine the phenylalanine will build up and decrease the functionality of the brain to the point of mental retardation if phenylalanine continues to be introduced to the body.