Show a Plot of GC Content
How do I display GC content (% G+C) next to a DNA sequence?
The option to show a "GC Content" plot is available in SnapGene 5.2 and later.
Open a DNA Sequence
Open a DNA sequence file, and display the sequence in Map view.
Turn on Display of "GC Content"
Click the "Choose color option" drop-down button in the side toolbar, and choose "GC Content". The adjacent button icon will indicate that a GC content plot is displayed.
A plot of "% GC" will be shown above the DNA line.
Configure the Plot
By default, the midpoint for the color range is set to the average %GC for the sequence. To adjust this midpoint, use the slider to the right of the plot.
Click on the range markers next to the slider to open a dialog for adjusting the total color range and the midpoint for the color range.
To see a plain graph, choose "No colors".
Click the axis label to the left of the plot to open a dialog for adjusting the minimum and maximum %GC values.
To export an image of the DNA map with the associated GC content plot, click File → Export Map.
Display Colored Bases in Sequence View
When the "GC Content" display option is chosen in Sequence view, G and C bases will be colored red while A and T bases will be colored blue.