Antimicrobial activities of tachyplesin isopeptides isolated from horseshoe crab amoebocytes : M. Niwa, S. Iwanaga∗, T. Nakamura∗, T. Miyata∗, F. Tokunaga∗, T. Murakami∗∗, T. Ohtake∗∗∗, M. Kanai∗∗∗, and N. Fujii∗∗∗∗.Department of Bacteriology, Osaka City University Medical School, Osaka 545, ∗Department of Biology, Faculty of Science, Kyushu University, Fukuoka, ∗∗Osaka City Institute of Environmental Science, Osaka, ∗∗∗Osaka Prefectural Institute of Public Health, Osaka, ∗∗∗∗Faculty of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan