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单词 periderm
释义
periderm

Biology
  • See cork cambium.


Geology and Earth Sciences
  • The thin, sheet-like material that makes up the skeleton in graptolites (Graptolithina). Long thought to be chitin, it is now considered perhaps to be collagen (a scleroprotein). It is bi-layered, with an inner fusellar layer and outer cortical layer which have distinct structural differences.


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