modlib: Target mediated disposition model
passed to update
KEL: elimination rate constant
KTP: tissue to plasma rate constant
KPT: plasma to tissue rate constant
VC: volume of distribution
KA1, KA2: absorption rate constants
KINT: internalization rate constant
KON: association rate constant
KOFF: dissociation rate constant
KSYN: target synthesis rate
KDEG: target degredation rate constant
CENT: unbound drug in central compartment
TISS: unbound drug in tissue compartment
REC: concentration of target
RC: concentration of drug-target complex
EV1, EV2: extravascular dosing compartments
CP: unbound drug in the central compartment
TOTAL: total concentration of target (complexed and uncomplexed)