表皮
anatomy
biology
cancer
cell
cells
cicatrisation
clinic
collagen
density
dermis
diagram
disease
elasticity
elastin
fibres
fibroblast
firmness
gel
glycoprotein
hemostasis
human
laboratory
medical
medicine
microfilaments
microscopy
mitochondria
nucleus
research
science
scientific
skin
stem
strength
structure
synthesised
wrinkle