15. Which statement of CRISPR (clustered regularly interspaces short palindromic repeats) is INCORRECT? (A) CRISPR are DNA sequences found in prokaryotic organisms (B) Cas9 enzymes together with CRISPR sequences known as CRISPR-Cas9 can be used to edit genes (C) CRISPR are derived from DNA fragments of bacteriophage genome (D) CRISPR are DNA sequences found in mammalian cells (E) CRISPR play a key role in antiviral defense system