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The effect of Mg2+ ions on the conformation of G-actin and in particular on the accessibility of its antigenic regions has been tested. Experiments were performed with G-actin coupled to Sepharose 4B which was, therefore, maintained in the monomeric state. The results presented her show that the 2mM MgCl2-perturbed antigenic site is located in a central region of the actin sequence.
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Roustan et al. (1985) studied this question.
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