A picture shows an iPS cell-derived myocardial sheet in Suita City, Osaka Prefecture on April 25, 2024. Pasona Group Inc. unveils a prototype of "iPS heart", a three-dimensional model of a heart measuring 2 cm in length, 1.5 cm in width, and 1 cm in thickness, on the same day. The aim is to create a heart from iPS cells and make it beat like a real heart. Pasona plans to display the heart during Osaka Kansai EXPO. EXPO 2025 will be held for 184 days from April 13 to October 13, 2025 at Yumeshima, Osaka. ( The Yomiuri Shimbun via AP Images )