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. 2017 Jan 5;7:39712. doi: 10.1038/srep39712

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(A) Freshly prepared culture. (B) Migration of spindle-shaped cells (arrows) out of the fat tissue in the collagen-I gel after 1 week of culture. (C) Migration of adipocytes (arrow) out of the fat tissue after 2 weeks of culture. (D) Spindle-shaped cells containing fat droplets (arrows) migrating into the collagen-I gel after 3 weeks of culture.