I am planning to purify the mononucleosome for cryoEM study. I have seen, people assemble the nucleosome from recombinantly expressed histones and then providing DNA sequence to it. Isn't this possible to islolate nucleosome and after enzymatic cleavage, followed by SEC chromatography for the cryoEM study ? I understand that there could be a population of others but it could be more relevant. Please suggest.