Researchers from Tokyo University and Waseda University in Japan have announced the development of a robot hand using human muscle tissues cultivated in a laboratory environment, making it the largest of its kind to date. This robotic hand can perform complex finger movements, such as grasping an object or moving the tip of a small item with precision. According to the official Kyodo news agency, scientists in Japan from Tokyo and Waseda Universities combined multiple thin muscle tissues taken from the human body into a single roll to function as a large muscle. The researchers used the cultivated rolled muscle tissues in the laboratory to develop a “biohybrid” robot hand that can perform some complex finger movements, like grasping small objects. Described as the “largest” of its kind by the researchers, the robot hand, including the forearm, is 18 centimeters long, has five fingers that can move separately using multiple joints, and exhibits a decrease in muscle contraction force over time similar to that in the human body, showing signs of fatigue after a 10-minute action. The researchers also noted that the performance of the robot hand returns to normal after approximately an hour of rest, indicating that this technology could pave the way for the production of humanoid robots or precise prosthetic hands in the future.