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1.Tian Li1,Dengfeng Yan1,Xiaohui Wang1,Li⁃ang Zhang1 and Ping Chen1,2,3(1.College of Biotech-nology,Southwest University,Chongqing 400715,Chi⁃na;2.State Key Laboratory of Silkworm Genome Biol⁃ogy,Southwest University,Chongqing 400715,China;3.Key Laborator