H are basic non value proteins. Localized in nucleus with mol. Mass (mm) 10000-20000 D. They contain of 30% diaminomonocarboxylic acids and have positive charge. Their IEP is equal 10.
They are precipitated by boiling and in alkalis. They are divided into 5 groups in dependence on the ratio of lys, arg, his in their primary structure and these groups are marked as H1, H2α, H2β, H3, H4. They regulate of the function of DNA in animal, they are contained in nucleus.