Mike Easterling, Constella Health Services A PBPK model for a mixture of dioxin-like chemicals. A PBPK model for dioxin (TCDD) was used as the framework for models of TCDD, PCB126, PeCDF, and a mixture of these three chemicals. A goal was to assess how a model developed specifically for TCDD would serve as a general Ah receptor model for other dioxin-like chemicals as well as a mixture of dioxin-like chemicals. I'll discuss the latest work on the model.