crispr - cas9 gene editing complex from streptococcus pyogenes. the cas9 nuclease protein uses a guide rna sequence to cut dna at

crispr cas cas9 clustered regularly interspaced short palindromic repeats dna rna virus bacteria gene resistance editing associated nuclease genome pdb5f9r streptococcus pyogenes transactivating sgrna drug cure therapy biotech interference engineering embryonic cell endonuclease enzyme bacterial immunity embryo drive patent germline modification structure peptide protein amino acid cartoon secondary red yellow sheet helix betasheet alphahelix sketch technical drawing pencil molecule polypeptide polymer atoms science scientific disease health molecular model 3d rendering illustration