library("Gviz")
gen <- "hg38"
chr <- "chr7"
start <- 38290160
end <- 38303219
if(interactive()){
gctrack<-gcContent_UCSC(gen,chr,start,end)
plotTracks(gctrack,from= start, to=end)
} else {
data(gctrack)
plotTracks(gctrack,from= start, to=end)
}
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