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Melting point profiles. (A) dG(TGGAA)2C and (B) d(TGGAA)10 in 50 mM sodium cacodylate buffer at pH 7.3 in the presence and absence of 100 mM NaCl or 20 mM MgCl2. Perfect duplex: d(G(TGGAA)2G/C(TGGAA)2C).