A nucleosome is a section of DNA that is wrapped around a core of proteins ... which are known as a histone octamer. Each histone octamer is composed of two copies each of the histone proteins ...

and now histamine help regulate brain physiology and behavior through chemical bonding of these monoamines to histone ...

They discovered that despite relatively weak binding by an essential protein—histone variant CENP-A/Cse4—to DNA, other proteins are recruited to one specific site in the center of the chromosome ...