| 1. | Suberin can also be found in various other plant structures.
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| 2. | Lignin and suberin are the only known biological polymers that are irregular.
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| 3. | Most are cork cells of plant bark contain suberin.
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| 4. | Suberin is found in the phellem layer of the periderm ( or cork ).
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| 5. | Both cutin and suberin are polyesters that function as permeability barriers to the movement of water.
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| 6. | In bark, phlobaphenes accumulate in the phellem layer of cork cambium, part of the suberin mixture.
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| 7. | The cells in this layer are dead and abundant in suberin, preventing water loss from the tissues below.
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| 8. | Often, other polymers such as lignin, suberin or cutin are anchored to or embedded in plant cell walls.
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| 9. | At this point, the cork cambium begins to form the periderm, consisting of protective cork cells containing suberin.
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| 10. | In addition to the aromatics and aliphatics components, glycerol has been reported a major suberin component in some species.
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