Affymetrix CEL files: which format and which tool?

Hi I've started to take a look to the CEL files contained in the ViralChallenge_training_EXPRESSION_CEL archive of this challenge. Two questions: 1) What is the CEL format of these files? Version 3 or Version 4? 2) What tool or software should we use to open them and read them? Thanks, -- Davide

Created by Davide Chicco davide.chicco
I assume these are version 4, which is a binary format, as opposed to version 3, which should be ascii. There are a number of packages which can read Affy cel files, including software from Affymetrix, as well as packages for R, Matlab, and tools for converting cel files to ascii. If you are unfamiliar with normalizing gene expression data, you may instead wish to use the normalized version of the data that we have provided.

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Hi I've started to take a look to the CEL files contained in the ViralChallenge_training_EXPRESSION_CEL archive of this challenge. Two questions: 1) What is the CEL format of these files? Version 3 or Version 4? 2) What tool or software should we use to open them and read them? Thanks, -- Davide

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