... Volume: Page: ... coefficients for oligomeric duplexes were approximated using A 260 = 16 800 M - 1 (G/C base pair) - 1 and A 260 = 13 600 M - 1 (A ... from the slope of the plots of k obs vs [L]. First-order off rates were determined from the y-intercept at [L] = 0 (Figure ...