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Affymetrix raw data files: CEL files
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.CEL is the extension used by Affymetrix to name data files storing probe intensity measurements. Information about the array design characteristics such as location of probes, probe-sets and probe-pairs is stored by Affymetrix in CDF files.
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In an experiment carried out using Affymetrix technology you will have a CEL file for each of the arrays you hybridized.
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In Babelomics, CEL files are considered to be the raw data files of the Affymetrix platform.
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Some CEL files can be in text format but most of them will be in ASCII or binary format. Do not be too surprised if you cannot open them using a text editor or an spreadsheet.
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Here you can find more information about Affymetrix CEL files format.
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Information about some other Affymetrix data files can be found here.
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You can download some examples data here.
Find the Babelomics suite at http://babelomics.org