https://bio.nikkeibp.co.jp/atcl/news/p1/22/06/10/09602/

To construct cultured skin on a flat surface, a collagen solution in which dermal cells are suspended is first gelatinized, and then dermal tissue is cultured on the gel. Then, epidermal cells are seeded on the surface of the cultured dermis to form an epidermal layer. In order to align the flat cultured skin with the surface of the finger-shaped robot, the research group devised the following methods: (1) anchoring the cultured skin at the base of the finger, and (2) seeding epidermal cells while rotating the finger-shaped robot. To create a cultured skin the size of a finger-shaped robot, 10 million cells were used for the dermis and 4 million cells for the epidermis. The team succeeded in creating a uniform skin tissue of approximately 1.5 mm on the surface of the finger-shaped robot.