Role of interferon-gamma in Valpha14+ natural killer T cell-mediated host defense against Streptococcus pneumoniae infection in murine lungs. - Nakamatsu M; Yamamoto N; Hatta M; Nakasone C; Kinjo T; Miyagi K; Uezu K; Nakamura K; Nakayama T; Taniguchi M; Iwakura Y; Kaku M; et al. (Microbes and infection, 2007)