There are currently two main types of microarrays: c-DNA- and oligonucle-otide-based arrays. These arrays may be made using different surfaces as solid supports. Glass and nitrocellulose are the still the most commonly used owing to their low cost and general availability (11-13), but they lack the versatility of Si surfaces such as the possibility of integration with other Si-based components such as micro PCR reactors (14), microfluidic transport, micro-capillary electrophoresis (15) and detection systems (16), uniformity of DNA deposition, and low signal-to-noise ratio (17,18).
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