Assertion: cambium's function | /r/CapableOf | perform in xylem tissue
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text: The similar expression pattern was also detected by analysis of the AspWood database ( http://aspwood.popgenie.org ) (Figure S4 b) (Sundell et al ., 2017 ), which prompted us to investigate what functions of these PtrCLE genes perform in xylem tissue and this study mainly focuses on PtrCLE20 .