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Gross views of the in vitro and in vivo samples. A: Monolayer chondrocyte cell sheet in vitro cultured for 2 weeks; B & C: Cartilage originated from monolayer chondrocyte cell sheet, after 8 weeks implanted in nude mice; D: Bilayer chondrocyte cell sheet in vitro cultured for 2 weeks; E & F: Cartilage originated from monolayer chondrocyte cell sheet, after 8 weeks implanted in nude mice.
