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Cysteine proteinase inhibitor (cystatin) genes belong to one family of proteinase inhibitors and play an important role in the resistance to insect pests. Cystatin (CYS) genes have been studied in different plant–insect interactions, but there are few reports about the importance of potato cystatin genes. In this study, a cystatin gene named SpCYS was characterized from the wild diploid potato Solanum pinnatisectum...