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Histochemical staining for HSV-1 vector-mediated β-galactosidase expression in mouse dorsal root ganglia. Swiss–Webster mice (6 weeks old) were infected, where indicated, with 5 × 107 plaque-forming units of virus. Staining in the ipsilateral L3 ganglia is shown. (A) Animal with no virus infection. (B) Animal infected with virus KHZ and killed 4 days postinfection. (C) Animal infected with virus KHZ and killed 40 days postinfection.
