A Sulfonoglycolipid with Na+, K+-ATPase Inhibitory Activity, Produced by a Cultured Unique Diatom Symbiot Isolated from a Larger Foraminifera - Rho, Mun-Chual; Matsunaga, Kimihiro; Park, Young-Hyun; Yasuda, Koubun; Yamasu, Terufumi; Mayama, Shigeki; Ohizumi, Yasushi (Planta Medica, 1996)