What are haptens? How are they related to Penicillin?
molecules too small to stimulate an immune response. they combine with larger protein molecules to function as Ags.
Penicillin is normally a nonantigenic molecule b/c it's so small. But it some ppl, it can chemically combine with body proteins to produce a complex that body generates an allergic rxn to. (i.e., Penicillin is a hapten in this instance.)