"The analysis did find significant differences in gene sequence between the eusocial and solitary bees. The researchers also saw patterns of genetic change unique to either the highly eusocial or primitively eusocial bees."Genes involved in convergent evolution of eusociality in bees,
Proceedings of the National Academy of Sciences
, Volume 108, Number 18, p.7472-7477 , (2011)
[1]