Processing Microarray Data: Applying a Color Scale

Numbers are often converted to a color scale to make it easier to see patterns. Results are often reported in papers this way.

Keep in mind that this is a different scale from the red and green fluorescent markers of the raw data.

A red-green color scale with the green end labeled repressed and the red end labeled induced. Below the scale, both ends are labeled 10-x, the midpoints between both ends and the center are labeled 3-x, and the centerline is labeled 1 to 1.

Log₁₀ in five samples of genes A, B, C, and D. Numbers converted to a color scale for easier pattern visualization. Greens=repressed; Black=1:1; Reds=induced.
	Gene A	Gene B	Gene C	Gene D
Sample 1	0.602	0	−0.481	0
Sample 2	0.301	−0.0969	0	0.114
Sample 3	0.544	0.301	−0.602	0.477
Sample 4	0.176	−0.301	−0.602	0
Sample 5	−0.0969	0	0.0792	−0.0969