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Poison Oak: A Resinous Shrub

This Resin Contains Urushiol, A Potent Allergen
Causing Severe Dermatitis In Sensitive Humans

Magnified view of stem cross section of poison oak (Toxicodendron diversilobum) showing showing circular resin ducts (rd) in outer phloem layer (green) just beneath the bark. The resin ducts also contain urushiol, the insidious allergen that causes the painful, itching rash.

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