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Please name me at least one reason.

I am referring to rats and to humans, as well.

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Hi, and welcome to Biology.SE! If this is a homework question, please give us your thinking on what the answer is, and why. We can certainly help you understand your studies, but we cannot do your work for you. If this is not homework, just let us know too :) –  MattDMo Jan 13 at 21:20
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Maybe we need a "this sounds like homework but isn't" tag –  Oreotrephes Jan 13 at 22:08
    
It's not clear, what you mean by "number of histones". If it's about number of different "types" of histones, there are always 5 families of them (H1, H2A, H2B, H3 ,H4), all of which are recruited in formation of the chromatin irrespective of the number of the chromosomes. –  har-wradim Jan 14 at 0:06
    
No it is'nt a homework. It is just interesting to me, personally. And no, I don't mean the families of histones. I am referring to the total count of histones. –  Norbert Willhelm Jan 14 at 8:55
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closed as unclear what you're asking by Chris, Daniel Standage, fileunderwater, WYSIWYG, Mad Scientist Jan 16 at 8:11

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