Intracellular signal triggered by cholera toxin in saccharomyces boulardii and saccharomyces cerevisiae - Amaral, Sheila C.; Bambirra, Eduardo A.; Brandao, Rogelio L.; Castro, Ieso M.; Dos Santos, Raquel G.; Fietto, Luciano G.; Gomes, Newton C. M.; Neves, Maria Jose.; Nicoli, Jacques R.; Tropia, Maria Jose M.