Positive selection drives the evolution of rhino, a member of the heterochromatin protein 1 family in Drosophila.
Heterochromatin comprises a significant component of many eukaryotic genomes.In comparison to euchromatin, heterochromatin is gene poor, transposon rich, and late replicating.It serves many important biological roles, from gene silencing to accurate chromosome segregation, yet little is Vacuums known about the evolutionary constraints that shape he