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Hi Kay2000, 

The main modification of poison ivy is to secrete oleoresin which contains pentadecylcatechols, which collectively are known as urushiol. 

Urushiol, in the oleoresin causes contact dermatitis in most mammals, blistering the skin and causing inflammation (often seen as a rash), it is particularly potent in the eyes and muscosal tissues. Therefore if consumed it can lead to severe poisoning and even death. 

Similar occurences are known in some squash leaves, but usually far less potent. 

Any questions let me know.


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