Andrea Cerutti et al.

Nature Immunol. 2, 150–156 (2001).

In the February issue of Nature Immunology, the sources of 315 (monoclonal antibody to OX40) and TAG34 (monoclonal antibody to OX40L) were reported incorrectly. The correct source for 315 is T. Hori, Kyoto University, Kyoto, Japan [Imura, A. et al. J. Exp. Med. 183, 2185–2195 (1996)] and TAG34 is Y. Tanaka, Okinawa-Asia Research Center of Medical Science, Okinawa, Japan [Tanaka, Y. et al. Int. J. Cancer 36, 549–555 (1985)].