We sanitize our labs before and after working with all organisms, regardless of whether they are genetically engineered or not. We work with microbial strains that are sometimes genetically modified but other times are not. We also work with plant cells and tissues under sterile conditions that may or may not be genetically engineered. It is critical to sanitize our work areas to maintain the purity of our cultures. The fact that we sometimes use genetically engineered organisms does not influence the need to sanitize our work areas in a more specific way. Sanitization of all work spaces is a standard procedure and a strict requirement in all of our facilities at Bayer.