Induction of neutralizing antibody against human immunodeficiency virus type 1 (HIV-1) by immunization with gp41 membrane-proximal external region (MPER) fused with porcine endogenous retrovirus (PERV) p15E fragment - Min Luo; Fei Yuan; Yanxia Liu; Siming Jiang; Xijun Song; Pengfei Jiang; Xiaolei Yin; Mingxiao Ding; Hongkui Deng (Vaccine, 2006)