how the histone proteins get formed and explain how they work?

Like all the proteins of the cell, histone proteins are synthesized by the process of translation. It occurs in the S phase of the cell division. 

The main function of histones is to pack the DNA strands compactly shortening it upto 40,000 times. This helps it to fit into the small nucleus of the cell.

Also, histones undergo post translational modifications in some biological processes like gene regulation, DNA repair, spermatogenesis etc. 

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