“Gluten” is a mixture of a range of proteins in the endosperm, which is essentially protein.
The “bran” is the seed coat removed before fine processing.
The hull – commonly known as the “bran” – is the outermost, dark yellow layer of the wheat kernel, which is removed during the finishing process to obtain a clean, white flour.
The main components of bran are fiber, B vitamins, and trace elements.