Zhang HY, Sun SH, Guo YJ, Zhu WJ, Shi K, Xu GX, Wang JJ. Optimization strategy for plasmid DNAs containing multiple-epitopes of foot-and-mouth disease virus by cis-expression with IL-2. Vaccine. 2008 Feb 06;26(6):769–77. doi: 10.1016/j.vaccine.2007.11.093. PMID: 18191307.