hello, there, I run into some problems in using biomaRt to mine the transcript structures: ============== library(biomaRt) mart<-useMart("ensembl", dataset="hsapiens_gene_ensembl") listAttributes(mart)$name->attrs attrs[grep("exon",attrs)] ============== why "structure_exon_stable_id", "structure_exon_chrom_start", "structure_exon_chrom_end" and "structure_exon_rank" are not avaliable? ================ sessionInfo() R version 2.7.1 (2008-06-23) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 attached base packages: [1] grid stats graphics grDevices utils datasets methods base other attached packages: [1] GenomeGraphs_1.0.0 biomaRt_1.14.0 RCurl_0.9-4 loaded via a namespace (and not attached): [1] tools_2.7.1 XML_1.96-0 ================= Thanks, --- Ligang [[alternative HTML version deleted]]