vertébré (1) peau (1) spectacle (1) protéine (1) densité (1) Development (1) Density (1) Fibroblast growth factors (1) Work (1) Waves (1) Travel (1) Skin (1) Process (Law) (1) Lays (1) Hair (1) Feathers (1) Expression (1) Example (1) Epidermis (1) Emus (1) Density (1) Cells--Motility (1) Cells (1) Cell aggregation (1) Buds (1) Bone (1) Birds (1) Acting (1) Embryos (1) Embryos (1)