Suberin  - Suberin is made up of long branched chains of fatty acids.  Outer Bark contains suberin, which is cork - phellem.  Cork resists breakdown by microorganisms.  More on the story: Suberin is a material that coats the inside walls of the outer bark or phellem. It waterproofs the cells. Suberin is a chemical that has many long chains of fatty acids. The chemical is highly resistant to breakdown by microorganisms. Suberin has been found in the barrier zone cells in some species of oaks. Suberin has also been found in the defense boundaries that form in inner bark after injury and infection.
    Suberin is a part of some boundaries, especially the barrier zone.

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