I guess the author does not realize a great flaw in "molecular biochemistry." Ask any biologist or chemist this. Life is not a mere combination of biology and chemisty. When we breakdown the biosystem into the minute details, of course there are chemical components. However, if you take that bio system merely as those chemical components, the bio system ceases at that moment. This is become a major flaw in today's every expanding bio-chemistry. We are yet to hone into that divide, that separates the bio and the chemical component of life. Some even question if such divide exists. So, what I am trying to say is immortality is not simple. In fact what we think we know about the functioning of protein and cells needs to readdressed.