Periderm
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Periderm is a layer of plant tisses derived from the cork cambium, and thus is secondary tissue, replacing the epidermis. Cells of the periderm are dead and the cell walls contain suberin. Periderm is also known as bark, the hard outer covering on many trees that helps them protect themselves from the elements.
In mammals, periderm is the outermost skin layer of the embryo.
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