How do I find out the specific nucleotide sequences used in the probe sets on microarrays for specific genes?

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Torsten Goldmann

For Agilent chips you find it in the raw data of the feature extraction software (txt-files) if a comprehensive display is chosen.

Gerard Tromp

Agree with the other answers, but many of the annotation packages in Bioconductor also have the probe sequence together with other annotation data. That makes Bioconductor convenient for retrieving most annotation data from one place.