Abstract
The ultracentrifuge pattern of purified ribonucleoprotein particles from isolated calf thymus nuclei has been shown to consist of many components, some of which exhibit aggregation and dissociation reactions that are influenced by divalent cations. The preparation of nuclear ribonucleoprotein particles in an aggregated state is very closely related to, and depends on, the presence of magnesium, and the condition of the extraction medium. Complete removal of magnesium from the ribonucleoprotein causes irreversible dissociation of the particles.
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