Protein structures also include carbon, hydrogen, oxygen, phosphorus,
sulfur and iron. As you can see, then, the word “protein” is actually an
arbitrary word giving a “structure” to building materials. Protein is actually an
arbitrary word that is assigned to any building material that the body needs.
However, its factual definition is that of a completed structure, like tissue
itself.
Amino AcidsESSENTIAL AMINO ACIDS (PROVIDED BY FOOD)
Cysteine
Histidine
Isoleucine
Leucine
Lysine
Methionine
Phenylalanine
Threonine
Tryptophan
Tyrosine
Valine
NON-ESSENTIAL AMINO ACIDS (PROVIDED BY THE BODY)
Alanine
Arginine
Aspartic acid
Citrulline
Glutamic acid
Glycine
Hydroxproline
Hydroxyglutamic acid
Norleucine