6.c. Rat brain after treatment with ganciclovir following transduction with the HS-tk gene. 
Note the absence of macroscopic tumor. 
6.d. Photomicrograph. Section through the the cavity within the brain left after treatment 
with GCV following transduction with the HS-tk gene. Note the normal appearance of 
the adjacent brain and lack of cell infiltrate. 
Recombinant DNA Research, Volume 15 
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