Hi Steffen, I encountered the following error while trying to obtain the sequence using archived sequence data from Zv7. Your help is greatly appreciated. Best regards, Julie mart <- useMart(biomart="ensembl_mart_51", dataset="drerio_gene_ensembl", archive=TRUE) Checking attributes ... ok Checking filters ... Ok seq1 = getSequence(id = "ENSDARG00000054562", type = "ensembl_gene_id", seqType = "gene_exon_intron", upstream = 350, mart = mart) Error in martCheck(mart, "ensembl") : This function only works when used with the ensembl BioMart > sessionInfo() R version 2.9.0 (2009-04-17) i386-apple-darwin8.11.1 locale: en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] org.Hs.eg.db_2.2.11 RSQLite_0.7-1 DBI_0.2-4 [4] biomaRt_2.0.0 loaded via a namespace (and not attached): [1] MASS_7.2-46 RCurl_0.94-1 splines_2.9.0 survival_2.35-4 tools_2.9.0 [6] XML_2.5-3 ******************************************* Julie Zhu, Ph.D Research Assistant Professor Program Gene Function and Expression University of Massachusetts Medical School 364 Plantation Street, Room 613 Worcester, MA 01605 508-856-5256 http://www.umassmed.edu/pgfe/faculty/zhu.cfm