Generally speaking, the small RNA sample comes in two variants:
- The un-grouped sample, either as it comes directly from the Extract and Count () or when it has been annotated. In this sample, there is one row per tag, and the feature ID is the tag sequence.
- The grouped sample created using the Annotate and Merge Counts () tool. In this sample, each row represents several tags grouped by a common Mature or Precursor miRNA or other reference.