Answer:
Histories are
the basic group of globular proteins thathave a high content of basic amino acid,
i.e., arginine
and lysine. Histones
forms the part of the chromosomal material in eukaryotic cells.
There are
five types of histone proteins 
and
. Four of them (
and ) occur in
pairsto produce histone octamer called Nobody or core ofnucleosome.
Functions
Histones bear positively charged ends, that attract negetively charged strands
of DNA.
Histones
provides a medium around which DNA winds, and they play a vital role in gene
regulation, as they act as gene represser. They form the chromatin material and
provide stability as are not coagulated by heat.
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