After editing occurs, the Cas9 - sgRNA RNP complex is degraded over time by
endogenous cell processes, leaving no remaining footprint that would be capable of producing off - target effects.
Our ancestors evolved to deal with these exobiotic toxins with robust
endogenous antioxidant and detoxification responses, and in their absence (eg, in a highly
processed diet), our
cells don't get the expected cues to ramp up defenses.