Histones play a role in packaging DNA into nucleosomes, and they are the main protein in chromatin. In addition, gene expression can be regulated by histones. Genes that are silenced are bound very tightly to a lot of histones, while those that are active are not. Modifications to histones are referred to as the histone code.
Definition of bolshevism. 1 : the doctrine or program of the Bolsheviks advocating violent overthrow of capitalism.
The war was triggered, as stated above, by the German invasion of Poland in September 1939. Another important factor was the long-standing Nazi ambition of destroying Bolshevism. This, together with the desire for expansion, led to the German invasion of the Soviet Union in June 1941.