). In S.carnosus, the molecular genetic determinants for nitrogen regulation, the nreABC genes, were identified and shown to link the nitrate reductase operon (narGHJI) and the putative nitrate transporter gene narT. The data provide evidence for a global regulatory system, with oxygen as the effectors molecule (Fedtke et al. 2002). The high dissimilatory nitrate respiration, typical of S. carnosus and involved in nitrate reduction in meat products, was found to be present in the genome of S. carnosus TM300 (Rosenstein et al. 2009).