Partek^® Flow^® provides Pre-alignment tools that allow the user to process next-generation sequencing data before proceeding to alignment. These tools are not only useful for controlling the quality of data, but can also be used for subsampling prior to analyzing the full dataset. There are three functions available in Pre-alignment tools:

User is expected to have preliminary understanding of:

• File formats for next generation sequencing data
• Phred-quality score

Showing Pre-alignment tools

In order to show the Pre-alignment tools, select an Unaligned reads or Trimmed reads data node. They will appear on the context-sensitive menu on the right of the screen (Figure 1).

Figure 1. Showing Pre-alignment Tools from an unaligned reads node

Different Pre-alignment tools are available for different formats of unaligned reads. For example: if the reads are in FASTQ format, then all three tools are available.On the other hand, if the unaligned reads are in FASTA or SFF format, then the option Subsample FASTQ is not available.

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