Total RNA was extracted from wild-type anthers during meiosis. Highly purified and intact mRNA was isolated using mRNA Purification Kit (Life technology, NO. 61006). cDNA library construction was performed using Make Your Own Mate & Plate Library System (Clontech NO.630490) according to the manufacturer’s instructions. The Y2H assay was conducted with Yeast Transformation System 2 (Clontech NO.630439). The yeast strain Y2HGOLD was used for library screening and Y2H assays. All primers used were listed in S2 Table.
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