Specific peptides of casein pancreatic digestion enhances the production of tetanus toxin - Porfirio, Z; Prado, S M; Vancetto, M D C; Fratelli, F; Alves, E W; Raw, I; Fernandes, Beatriz Lieblich; Camargo, Antonio Carlos Martins de; Lebrun, I (Journal of Applied Microbiology, 1997)