1. Key Laboratory of Functional Polymer Materials, Ministry of Education, State Key Laboratory of Medicinal Chemical Biology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China
2. The National and Local Joint Engineering Laboratory of Animal Peptide Drug Development, College of Life Sciences, Hunan Normal University, 36 Lushan Road, Changsha, Hunan 410000, China
3. Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, 94 Weijin Road, Tianjin 300071, China