13 Sep 2007
The human works on the "all or nothing" principle in protein synthesis. Only complete proteins, as opposed to partial proteins, can be utilized.
The same situation can occur when an essential amino acid is destroyed as the result of heating protein to extreme temperatures. In this case, all of the other amino acids in the protein become limited. This is referred to as the "limiting factor" of a protein. For example, cooking egg whites may result in a limited protein.