A mart object, see useMart of biomaRt package for details.
featureType
TSS, miRNA, Exon, 5'UTR, 3'UTR, transcript or Exon plus
UTR. The default is TSS.
Value
GRanges or
RangedData with slot start holding the start
position of the feature, slot end holding the end position of the feature,
slot names holding the id of the feature, slot space holding the chromosome
location where the feature is located. In addition, the following variables
are included.
strand
1 for positive strand and -1 for negative strand
where the feature is located
description
description of the feeature such as gene
References
Durinck S. et al. (2005) BioMart and Bioconductor: a powerful
link between biological biomarts and microarray data analysis.
Bioinformatics, 21, 3439-3440.