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Chromatin released from dead host cells during in vitro production of IgG monoclonal antibodies exists mostly in complex hetero-aggregates consisting of nucleosomal arrays (DNA+histone proteins), non-histone proteins, and aberrant forms of IgG. They bind immobilized protein A more aggressively than IgG, through their nucleosomal histone components, and hinder access of IgG to Fc-specific binding sites,...
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