TIL expressing neomycin phosphotransferase (NPT). Cell lysate from TIL were 
assayed for the presence of NPT by measuring the phosphorylation of kanamycin 
with P^2 labelled gamma-ATP after separation of NPT from endogenous 
phosphotransferases on a non-denaturing polyacrylamide gel. N7 control = from 10^ 
PA317 fibroblasts producing the N2 virus. For each patient, control = 10° 
uninfected, unselected TIL; N7 = 10° N2 infected, G418 selected TIL. 
Recombinant DNA Research, Volume 14 
[17] 
