Most protein coding genes express one predominant transcript. (a) Relative abundance of the subset of transcripts in each position of the ranking for the primary tissues dataset. For each gene, transcripts were ranked based on their relative abundances. There is generally one predominant transcript over the rest. ( b ) Percentage of the studied mRNA pool explained by each category of transcripts for the BM dataset. The mean percentage for all samples is represented here. Major transcripts represent approximately 85% of the studied mRNA population and were further classified into two-fold and five-fold dominant. (c) Expression distribution for major and minor transcripts in the tissue dataset. We detect a total of 31,902 transcripts expressed above 1 FPKM in at least one tissue and 26,641 different major transcripts.