 With this in mind, centromeric heterochromatin was found on the bisatellited and ring markers, but not on the mar del(10) marker.However, mar del(10) was still able to stably segregate in vivo and in vitro which implied the presence of a functional centromere and kinetochore.There has been an assumption that centromeric heterochromatin is just as important as the kinetochore in segregating and stabilizing chromosomes, because heterochromatin is associated with protein recruitment and has the defining ability to silence gene expression.