We examined the patterns of expression of 53,934 transcribed genes across tissues [on the basis of Gencode V12 annotations] (14, 15). The number of biotypes [protein-coding genes, pseudogenes, and long noncoding RNAs (lncRNAs)] that were transcribed above a minimal threshold [reads per kilobase per million mapped reads (RPKM) > 0.1] was similar for most tissues (average of 20,940) (fig. S3B). Testis was an outlier, with substantially more transcribed regions detected than other tissues (31,240 on average), many of which are lncRNAs. Whole blood was also an outlier, exhibiting the fewest detected transcribed regions (17,160 on average).
