A function to extract reads from a stranded RNA-seq BAM file. Intended to be used as a custom importFunction in the DataTrack constructor of Bioconductor's Gviz package. With properly stranded data this allows the plotting of coverage tracks from each strand of the genome. 6 Nov 2014 - bensidders at gmail dot com UPDATE: 10 Sep 2015: The funciton can now plot data from libraries created in either orientation. Due to the manner in which Gviz calls §this function, you need to specify the library orientation with a global variable "libType" to be one of "fr-firststrand" or "fr-secondstrand".
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