<<Disclaimer: Verify this information before applying it to your situation.>> The gluten proteins in wheat are seed (grain) storage proteins that provide a source of nitrogen and amino acids for the new plant upon germination of the embryo. The high levels of glutamine and proline in wheat gluten proteins are present presumably because these amino acids can be efficiently transformed by the plant into all the other amino acids (and then all the many different proteins) needed by the new wheat plant for differentiation and growth. Don Kasarda, Albany, CA