Transcription factors were identified using PlantTFDB (http://planttfdb.gao-lab.org/), which included the sequences of 58 plant transcription factor families from 165 plant species [37]. The unigene sequence was compared with the transcription factor database by BLASTx alignment, and the gene with the best E-value less than 10−5 was selected as the annotation information of the unigenes.
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