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Surface-density dependency of H-Ras dimerization. Quantification of degree of H-Ras dimerization by PCH and SMT analysis. The cluster size, measured as a ratio of molecular brightness of the two species in PCH analysis (B2/B1), is shown at the top and degree of dimerization as function of surface density is shown at the bottom. Data are fitted with Eq. 1 to obtain Kd.
