Aleurone

Rarity: Common

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What Wikipedia says

Aleurone (from Greek aleuron, flour) is a protein found in protein granules of maturing seeds and tubers. The term also describes one of the two major cell types of the endosperm, the aleurone layer. The aleurone layer is the outermost layer of the endosperm, followed by the inner starchy endosperm.

Excerpt from the Wikipedia article “Aleurone”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: User:Asbestos, CC BY-SA 2.0, via Wikimedia Commons.