To display the Sequence Logo track:

To display or hide the Sequence Logo track in the Sequences view footer, perform an alignment and then check or uncheck the Sequence Logo box in the Tracks panel. This box is only visible after performing an alignment.


How Sequence Logo is calculated:

The Sequence Logo is a visualization of the nucleotide or amino acid at a given position, based on a formula for the Shannon uncertainty measure given by Schneider and Stephens (1990). The height ranges from 0-2 for nucleotides and 0-4.3 for proteins, and is proportional to the amount of information available for each character. Hover over the logo to reveal a tooltip with the information content of each letter at the position.


To change Sequence Logo options:

To learn how to access the options section for this track, see Tracks.

  • The accuracy of this calculation is proportional to the number of sequences in the alignment, and the track may not be displayed if there are too few sequences. We recommend checking Small sample correction when there are relatively few sequences without gaps represented at a given position. This correction has no affect when there are sufficient numbers of sequences to provide a good estimate of information content. Values will be zero if Small sample correction is used with fewer than four aligned amino acid sequences.

Click if you wish to return to the default values.

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