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The distribution patterns of Apple stem grooving virus (ASGV) and Apple chlorotic leaf spot virus (ACLSV) in in vitro-cultured pear plants were investigated using in situ tissue-printing hybridization (TPH) and tissue blotting immunoassay (TBIA) to detect viral RNAs and coating proteins. Both ASGV and ACLSV showed high concentrations in the tip of the pear shoots and lower concentrations in the middle...
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