Polymyxins as Novel and Safe Mucosal Adjuvants to Induce Humoral Immune Responses in Mice. - Yoshino, Naoto; Endo, Masahiro; Kanno, Hiroyuki; Matsukawa, Naomi; Tsutsumi, Reiko; Takeshita, Ryosuke; Sato, Shigehiro (PLoS ONE, 2013)