3.1.13.1 0.41 - Poly(A) 35-nt poly(A), wild-type, at 37°C, in 20 mM Tris-HCl buffer, pH 8, 100 mM KCl, 1 mM MgCl2, and 1 mM dithiothreitol 709032 3.1.13.1 80800 - Poly(A) 35-nt poly(A), mutant E542A, at 37°C, in 20 mM Tris-HCl buffer, pH 8, 100 mM KCl, 1 mM MgCl2, and 1 mM dithiothreitol 709032