- An intact dilysine-like motif in the carboxyl terminus of MAL is required for normal apical transport of the influenza virus hemagglutinin cargo protein in epithelial Madin-Darby canine kidney cells. Puertollano, R., Martínez-Menárguez, J.A., Batista, A., Ballesta, J., Alonso, M.A. Mol. Biol. Cell (2001)