Capsules contain 30% Me-Hg label in both the bis(FLIVI) and bis(FLIVIGSII) peptides at 0.1 mM. The images were captured using annular dark field mode and then inverted to produce the final image. The scale bars at the bottom of the micrographs, in nm, are 200, 500, 200, 100, 200, and 500, for the 0, 5, 10, 30, 60 and 120 min time points, respectively.