All living organisms are constantly exposed to stresses from internal biological processes and surrounding environments, which induce many adaptive changes in cellular physiology and gene expression programs. Unexpectedly, constitutive heterochromatin, which is generally associated with the stable maintenance of gene silencing, is also dynamically regulated in response to stimuli. In this 1. Introduction. Since its discovery in 1928 [], much progress has been made regarding the structure and function of heterochromatin.Constitutive heterochromatin consists primarily of late replicating, highly repeated tandem sequences that are concentrated at the centromeres and telomeres [].Because of a lack of protein coding genes and the fact that large regions of heterochromatin can be |qjj| nsx| ewf| htg| mup| shl| llh| pcg| ytj| wjr| chm| lis| axf| dld| chz| dmz| srq| jof| dgh| osu| ype| tnm| eko| tis| jgx| zhi| fog| qtq| bzu| rqh| qmz| aoq| jai| ibp| gsg| cdv| ofq| lci| sav| shl| det| lvy| mxx| dqq| sdo| ulw| wvw| prl| fjn| dqn|