Figure 1.

An example of a group of adjacent genes that are similarly expressed (adapted from [1]). For each square on the grid, red denotes relative expression higher than the average for a gene in an experiment, green denotes lower relative expression and black indicates that the expression is equal to the average. There are over 200 such groups within the Drosophila genome.

Weitzman Journal of Biology 2002 1:2   doi:10.1186/1475-4924-1-2