The core of the histones H2A and H2B can also be modified. Combinations of modifications are thought to constitute a code, the so-called histone code. Histone modifications act in diverse biological processes such as gene regulation, DNA repair, chromosome condensation (mitosis) and spermatogenesis (meiosis).
Bread and Circuses. Bread and circuses became the method that the ruling class of ancient Rome used to maintain their power and control of the people. This method kept their sheep fat and happy, even as they fleeced them and sent them off to plunder the free world.
In his book Bread and Circuses, Patrick Brantlinger analyzes the idea of bread and circuses as a narcotic for the masses throughout history. Though he never mentions Richard Dawkin's theory of memetics, the book is the history of a meme, a collection of related ideas replicating through history.