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In situ hybridization of shoot apical meristem and lateral buds of apple and pear seedlings infected with ALSV. (A) and (C), apple seedlings grown at 25°C. (B) and (D), apple seedlings grown at 37°C for 4 weeks followed by 25°C for 4 months. (E) Pear seedling grown at 25°C. (F) Pear seedling grown at 37°C for 4 weeks followed by 25°C for 4 months.
