{HEAD ~ The model structure} represents {TAIL ~ the patient response} with a time delay, a time constant for response speed, and a nonlinear function for drug sensitivity 
represents
{ HEAD ~ The model structure } represents { TAIL ~ the patient response } with a time delay , a time constant for response speed , and a nonlinear function for drug sensitivity
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH