Figure 10.3   Animal embryos from the Doushantou Formation, China. (a) Surface of embryo based on tomographic scans together with (b) an orthoslice revealing subcellular structures analogous to modern lipids and (c) an orthoslice at the boundary between two cells. (c, f) Two-cell embryo of the sea urchin Heliocidaris showing lipid vesicles for comparison. (e) Orthoslice rendering of a possible embryo revealing internal structures. (gi) Models of tetrahedrally arranged cells. Relative scale bar (see top left): 170 m (ad, f), 270 m (e), 150 m (gi). (Courtesy of Philip Donoghue.)

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