R. F. Oliveira, M. Lopos, L. A. Carneiro, A. V. M. Canário Nature 409, 475 (2001)

The Mann–Whitney test P values given in Fig. 1 were incorrect. In Fig. 1a, these should have been (from left to right) P < 0.05, P < 0.01 and P < 0.01; and P < 0.05 in Fig. 1b.