Dear Weibin, Even if the design is outdated, you can find an up-to-date mapping of the probesets to the latest genome assembly in EnsEMBL (http:// www.ensembl.org/Danio_rerio/Info/Index) You can retrieve this mapping with Biomart for example (http:// www.ensembl.org/biomart/martview/) Hope this helps Julien