Several new RT2 Profiler PCR arrays are available for gene-expression profiling in nephrotoxicity, hepatotoxicology, differentiation, and embryonic stem cell markers as well as analysis of epigenetic modulators and enzymes. Covering more than 100 pathways, PCR arrays enable scientists to analyze gene expression in research areas such as cancer, stem cells, biomarker discovery, and immunology. The RT2 Profiler PCR array is composed of PCR array plates, RT2 first strand kit, RT2 SYBR Green Master Mix, and PCR array data-analysis software.