Figure S1 | Mechanically self-organized tesselations of polygonal units, resulting from the swelling of polyacrylamide hydrogels immersed in water, related to Figures 1 and 6. -- Figure S2 | Statistics of the polygonal units in a cow rhinarium, related to Figures 1 and 7. -- Figure S3 | Histology of cow, dog, and ferret rhinaria at various developmental stages, related to Figures 1 and 2. -- Figure S4 | Light-sheet microscopy imaging of proliferating cells in the embryonic rhinarial skin of a cow, a dog and a ferret, related to Figure 3. -- Figure S5 | Light-sheet microscopy imaging of proliferating cells in the embryonic rhinarial skin of dogs at different developmental stages, related to Figures 4 and 7. -- Figure S6 | Statistical divergence between the rhinarial patterns of cows, dogs and ferrets, related to Figure 1. -- Figure S7 | Networks of collagen fibers in the rhinarial skin of dog embryos, from light-sheet microscopy images, related to Figures 3 and 7

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