Next, cells are inoculated with {HEAD ~ neurotropic virus} under {TAIL ~ conditions} that restrict viral propagation 
under
Next , cells are inoculated with { HEAD ~ neurotropic virus } under { TAIL ~ conditions } that restrict viral propagation
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH