#' @name gtf_dataframe
#' @title data frame (in gtf-inspired format) for chromosome 22, hg19
#' @description In the data frame \code{gtf_dataframe}, each
#' row corresponds to an exon / coding sequence / start codon / stop codon,
#' and the columns correspond to standard GTF columns denoting annotated
#' genomic features. See
#' \url{http://www.ensembl.org/info/website/upload/gff.html}.
#' @docType data
#' @format data frame, 9 columns, 17769 rows
#' @source Illumina iGenomes, hg19, 6 March 2013 version:
#' \url{http://ccb.jhu.edu/software/tophat/igenomes.shtml}.
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