The aleurone layer in maize grain is specially rich in:

The aleurone layer of maize grain is especially rich in proteins in mature seeds and tubers. It forms the outermost layer of the endosperm. Related Theory Aleurone lies between the pericarp and the hyaline layer of the endosperm. Unlike the cells of the starchy endosperm, aleurone cells remain alive at maturity. The ploidy of the aleurone is (3n) as a result of double fertilization.