8813
In this study , two full - length XTH genes ( DKXTH1 and DKXTH2 ) were identified from ' Fupingjianshi ' persimmon fruit , and the expression level of both XTH genes was investigated during softening for 18 - 24 d using RT - qPCR .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
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