es:
## [1] stats4    parallel  methods   stats     graphics  grDevices utils    
## [8] datasets  base     
## 
## other attached packages:
## [1] GenomicRanges_1.24.0 GenomeInfoDb_1.8.1   IRanges_2.6.0       
## [4] S4Vectors_0.10.0     BiocGenerics_0.18.0  BiocStyle_2.0.2     
## [7] rmarkdown_0.9.6     
## 
## loaded via a namespace (and not attached):
##  [1] Rcpp_0.12.5     digest_0.6.9    formatR_1.4     magrittr_1.5   
##  [5] evaluate_0.9    zlibbioc_1.18.0 stringi_1.0-1   XVector_0.12.0 
##  [9] to