<i>Streptococcus pyogenes</i> (IMAGE) Helmholtz Centre for Infection Research Caption Streptococcus pyogenes, shown here while entering a cell, is one of the germs whose CRISPR-Cas system the scientists from Braunschweig have studied. Credit © HZI / Rohde Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.