Fig. 2

Raw data filtering and mapping statistics. a The statistics of raw reads from the preprocessing and mapping steps. A total of 387.4 million raw reads were processed. A total of 11.9 million reads were filtered during the preprocessing step (aqua bar). Reads that could not map to the bovine genome were 115.3 million (purple bar). This number (115.3 million) includes reads which mapped to more than 5 genomic locations. Finally, reads that mapped successfully to the bovine genome (Bta_4.6.1) were 260.2 million (red bar). b The relative abundance of different classes of small RNAs in the total reads that were successfully mapped to the bovine genome; (c) Length distribution of the mapped reads across all the libraries