Extended Data Fig. 6: SEM, FIB and TEM images of the melanosome in the eyes of Haikouichthys ercaicunensis.
From: Four camera-type eyes in the earliest vertebrates from the Cambrian Period
a-b, Backscattered electron image (SEM) of H. ercaicunensis head. c-d, Secondary electron image (SEM) of the melanosome in the eyes (arrowed in a) of H. ercaicunensis. e, f, FIB slicing of the eye (arrowed in a) of H. ercaicunensis. g, i, TEM images of single melanosomes microbody, with enlarged details in i (boxed in g). h, Carbon (C, red), silicon (Si, blue), and iron (Fe, green) elemental map of a single melanosome as shown in g. Scale bars, 500 μm (a); 20 μm (b); 2 μm (c-f); 100 nm (g, h); 20 nm (i).
