Data used.

For each experiment, the reads were annotated using mmannot and available annotation files. The meaning of each row follows. 1: Organism. 2: SRA id. 3: Related publication. 4: Tissue from which the RNA was extracted. 5: Number of sRNA-Seq data sets. 6: Number of reads per sample. 7: Percentage of reads which passed the quality threshold. 8: Number of mapped reads (given by BWA) in each data set. 9: Percentage of unmapped reads, i.e. the proportion of reads that cannot be placed on the genome. 10: Number of hits, i.e. the number of possible positions for the reads (given by BWA). 11: Number of features in the annotation, extracted from the annotation file. 12: Time spent by mmannot for each data set, in minutes.针对每项实验，均使用mmannot及可用注释文件对读段（reads）进行注释。各行含义依次如下：1. 物种；2. SRA编号；3. 相关文献；4. 提取RNA的组织；5. sRNA-Seq数据集数量；6. 单样本读段数；7. 通过质量阈值的读段占比；8. 各数据集中经BWA比对得到的比对读段数；9. 未比对读段占比，即无法比对至参考基因组的读段比例；10. 命中数，即读段的潜在比对位置总数（由BWA给出）；11. 从注释文件中提取的注释特征数；12. mmannot处理每个数据集所花费的时间，单位为分钟。