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aleurone layer

The single layer of large cells under the bran coat and outside the endosperm of cereal grains. It forms about 3% of the weight of the grain, and is rich in protein, as well as containing about 20% of the vitamin b1, 30% of the vitamin b2 and 50% of the niacin of the grain. Botanically the aleurone layer is part of the endosperm, but in milling it remains attached to the inner layer of the bran.