Strawberry allergies

I found out a friend of Dale's experiences the same thing I do when eating Strawberries.  His mouth gets sore.  So I once again went off in search of information.  I read a few articles, and was led to a substance called Bromelain.  It exists in Pineapple especially, and is a type of "protease" enzyme which breaks down protein.  Kiwi has one such substance as well, known as actinidin.  Figs have ficin.

Interestingly enough, Actinidin is also present in pineapples, mangoes and papayas.

http://en.wikipedia.org/wiki/Bromelain#Other_plant_proteases

http://en.wikipedia.org/wiki/Actinidin

I am falling asleep in the middle of this research and don't want to lose research, so here is so far such search of re.