Heterosubtypic neutralizing monoclonal antibodies cross-protective against H5N1 and H1N1 recovered from human IgM+ memory B cells. oleh Mark Throsby, Edward van den Brink, Mandy Jongeneelen, Leo L M Poon, Philippe Alard, Lisette Cornelissen, Arjen Bakker, Freek Cox, Els van Deventer, Yi Guan, Jindrich Cinatl, Jan ter Meulen, Ignace Lasters, Rita Carsetti, Malik Peiris, John de Kruif, Jaap Goudsmit