Eppendorf DualChip microarray systems are offered for gene expression analysis and pathway identifications in toxicology, neuroscience, signal transduction, and research on aging using human or rat models. Xmer technology-based probes contain long single-stranded DNA to ensure maximum signal and minimum background. Each slide contains two identical microarrays printed side-by-side. Each array is also enclosed with a pre-attached hybridization chamber that allows the sample to be filled conveniently through an inlet, eliminating the need for coverslips.