1. Regenerative Medical Bioreactor Project, Kanagawa Academy of Science and Technology, KSP East 309, 3‐2‐1 Sakado, Takatsu‐ku, Kawasaki, Kanagawa 213‐0012, Japan
2. Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences 2‐5‐1 Shikata‐cho, Okayama 700‐8525, Japan
3. Nano Medical Engineering Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2‐1 Hirosawa, Wako, Saitama 351‐0198, Japan