Oliver R. W. Pergams, Wayne M. Barnes, Dennis Nyberg

Nature 423, 397 (2003)

There is an error in the Volo Bog and Glenview components of Fig. 1 of this communication: two Mw haplotype mice were shown in the 1950–99 column of the former that should have been in the 1950–99 column of the latter. This mistake does not affect the conclusions, as the analysis was done with mice from the correct category. Sample sizes (left and right columns, respectively) for the different locations were: Volo Bog, 19 and 41; Glenview, 5 and 6; Illinois Beach, 8 and 5; Highland Park, 2 and 5; Palos, 1 and 8 (note that sample numbers were inevitably low for museum specimens).