Fig. 2 | Nature Communications

Fig. 2

From: Fossilized skin reveals coevolution with feathers and metabolism in feathered dinosaurs and early birds

Fig. 2

Ultrastructure of the soft tissues in Confuciusornis (IVPP V 13171). a, b Backscatter electron micrographs; all other images are secondary electron micrographs. a, b Closely packed polygons. c Detail of polygons showing fibrous contents, with d interpretative drawing. e–g Polygon (e) with detail of regions indicated showing tonofibrils bridging (f) and abutting at (g) junction between polygons. h, i Helical coiling in tonofibrils. h Oblique view of polygon with central tonofibrils orientated perpendicular to the polygon surface. j, k Polygons showing stretching-like deformation

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