Watch Chapter 1 of a lecture from the 9th MACS Colloquium at Kyoto University Graduate School of Science, where Professor Kazutoshi Mori discusses protein quality control, focusing on the fundamental question "What is a cell?" Delivered in Japanese at Lecture Room 401 of Science Building 6, this 10-minute segment is part of a larger educational series available through Kyoto University's OpenCourseWare platform.