This is a very nice article and very clearly explained. I remembered a few things from my old biology courses at high school (many decades ago) and also things from a cartoon I watched much more recently with my kids, once upon a time life.
I am by the way happy to have discovered you (I was away during two-three months, which is probably when you arrives on SteemSTEM)! :)
RE: ALLERGIES AND THE DEFENCE AGAINST DISEASES #2