A method to determine the ability of {HEAD ~ a non neurotropic virus} to become quiescent and reactivatable in {TAIL ~ a PC12 cell line}, comprising: 
A method to determine the ability of { HEAD ~ a non neurotropic virus } to become quiescent and reactivatable in { TAIL ~ a PC12 cell line } , comprising :
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH