Which of the following proteins is found in cereal grains (such as wheat, barley, and rye), as referenced in image_3a2500.png?

Gluten is a structural protein naturally found in certain cereal grains, particularly wheat, barley, and rye. It gives elasticity to dough, helping it rise and keep its shape, often leaving the final product with a chewy texture.

* Arginine is an amino acid, not a specific cereal protein matrix.
* Delta protein and Gum protein are incorrect designations in this context.