As with other enhancer-binding proteins, nuclear receptors act as transcription factors by binding to specific DNA recognition sequences generally located upstream of responsive genes. Although RARs can activate gene expression through binding to thyroid hormone response elements, a much more specific and potent RA response element (RARE) has been identified recently within the promoter of the RAR-beta gene. This RARE is essential for RA induction of the RAR-beta gene and, when linked to heterologous promoters, can confer transcriptional activation via all three RARs. · Nimeta RA-reguleeritud märklaud geene. Some of these genes are the homeotic genes that specify the position of the cell along the anterior-posterior axis and therefore will cause the cell to display different characteristics. (2) They repress the activity of the AP-1 transcription factor. This transcription factor is important in activating those genes responsible for cell division and for the production of
Furthermore, sanitizing agents and be undetectable with in vitro studies suggest that exposure of common plating methods, they may recover pathogens to sublethal levels of certain meat and restore their acid resistance during sub- decontamination chemical agents may induce sequent exposure to fresh meat decontamina- tolerance to lethal levels of the same bio- tion run-off fluids (Skandamis et al. 2009). cides, as well as to other (heterologous) However, the role of acid adaptation on stresses (cross-resistance or protection). microbial resistance to decontamination Specifically, Sampathkumar et al. (2004) treatments possibly depends on the microor- found that pre-treatment of S. enterica ganism and product storage conditions, since serovar Enteritidis with sublethal levels of acid adaptation of L. monocytogenes did not TSP (i.e., 1.5%) increased tolerance to higher
annaabi.ee 
