Before revision: When exploring statistical properties of genetic sequences two main features stand out: the existence of non-random structures at various scales (e. g., long-range correlations ) and the presence of symmetries (e.g., Chargaff parity rules).
After revision: When exploring statistical properties of genetic sequences emerged and are maintained through evolution. On the one hand, non-random structures at various scales (e. g., long-range correlations ) and the presence of symmetries (e.g., Chargaff parity rules).