Is cereals a good source of protein?

Cereals are grasses that are cultivated for their edible grains. In their unrefined form (whole grain), they are a rich source of protein, along with vitamins, minerals, carbohydrates, and fats. However, when they are refined into products like white flour, white rice, and most breakfast cereals, their nutritious bran and germ are removed, and what remains is mostly carbohydrate and lacks most of the other nutrients.