12. 1 Cell aging 12.2 Mechanism of cell aging 12. 3 Cell aging and medicine 13. Cell death(16 week 13. 1 Cell death 13.2 Regulation of cell death 13.3 Cell death and Medicine12.1 Cell aging 12.2 Mechanism of cell aging 12.3 Cell aging and medicine 13. Cell death(16th week) 13.1 Cell death 13.2 Regulation of cell death 13.3 Cell death and Medicine