Gene microarrays complementary oligonucleotide

Photometer, Figure 2 DNA microarrays. The probes are complementary fragment oligonucleotides, of target DNA or mRNA are spotted onto the microarray surface. This type of array is typically hybridized with target cDNAs that are labeled with fluorophores. The samples are amplified by PCR and hybridized to the microarray, and then scanned in a microarray scanner to visualize fluorescence of the fluorophores on the chip. Absolute levels of gene expression cannot be determined, but relative differences in expression among different spots can be estimated when we used the two-color array, each color represents two different samples... 

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