“Balancing Selection, Not Hybridization, Maintains Shared MHC Alleles in Sympatric and Parapatric Populations of Alpine and Brown Hares in Switzerland: Genetic Diversity of MHC Class II Genes and Microsatellites”

https://pubmed.ncbi.nlm.nih.gov/38114658

The abstract reports findings on the genetic diversity of MHC class II genes and microsatellites in sympatric and parapatric populations of Alpine mountain hares and brown hares in Switzerland, suggesting that balancing selection, not hybridization, maintains shared MHC alleles between species.