&gt;is it possible to substantially alter the genome of an already living creature?<p>Roy: I want more life, fucker (father).<p>Tyrell: The facts of life: To make an alteration in the evolvement of an organic life system is fatal. A coding sequence cannot be revised once it&#x27;s been established.<p>Roy: Why not?<p>Tyrell: Because by the second day of incubation, any cells that have undergone reversion mutations give rise to revertant colonies like rats leaving a sinking ship; then the ship sinks.<p>Roy: What about EMS recombination?<p>Tyrell: We&#x27;ve already tried it. Ethyl methane sulfonate is an alkylating agent and a potent mutagen. It created a virus so lethal the subject was dead before he left the table.<p>Roy: Then a repressor protein that blocks the operating cells.<p>Tyrell: Wouldn&#x27;t obstruct replication, but it does give rise to an error in replication so that the newly formed DNA strand carries a mutation and you&#x27;ve got a virus again. But this - all of this is academic. You were made as well as we could make you.