Low-affinity B cells transport viral particles from the lung to the spleen to initiate antibody responses. - Bessa, J; Zabel, F; Link, A; Jegerlehner, A; Hinton, H; Schmitz, N; Bauer, M; Kündig, T; Saudan, P; Bachmann, M (Proceedings of the National Academy of Sciences of the United States of America, 2012)