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.
Piazza di Spagna. The Piazza di Spagna is one of the most popular meeting places in Rome. It is also one of the most visually pleasing squares. The combination of a monumental staircase (the famous Spanish Steps), an obelisk and a beautiful church is a draw for tourists and photographers.