Model (IMAGE) University of Münster Caption Researchers discovered a new family of certain acetyltransferases (GNAT) in the chloroplasts of plant cells (centre). The enzymes can drive two different acetylations on protein sequences (colourful chains of amino acids). Credit Annika Brünje/ Molecular Systems Biology Usage Restrictions Please use this picture only in connection with the press release. 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.