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Nature Genetics 40, 139 (1 February 2008) | doi:10.1038/ng0208-139

Research highlights

Interbreeding depends on genetic compatibility, with selection expected to weed out any incompatibilities from such populations. Hannah Seidel and colleagues report an unusual example of widespread incompatibility in Caenorhabditis elegans that seems to be maintained by balancing selection (Science, advance online publication 10 January 2008; doi:10.1126/science.1151107).