Fig. 3.

a) Peculiar sigmoidal feature for 60 nm gold colloid coated with S protein. All data points are shown. b) Peculiar sigmoidal feature for 60 nm gold colloid coated with S protein. The red points which show peculiar behaviors were removed from the fit for Boltzmann model given in Eq. (2). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)