Figure 4.
Representative AFM images of Aβ42 aggregates in the presence (a) and absence (b) of Cu2+ cations at pH 7.4. Yields of aggregates formed in the presence of Cu2+ cations (c) and absence of Cu2+ cations (d) are shown in pie charts. Mature fibrils, protofibrils and oligomers are colored in black, red, and green, respectively.