<p>Each shaded index represents the normalized frequency of hits containing the row gene that also contain the column gene out of the total number of hits containing the row gene, as denoted by (#). The matrix on the left is a representation of an unbiased set of evenly distributed homologs (AB, BC, CD, ABC, BCD, and ABCD). The middle matrix is the actual coincidence data. The matrix on the right is a heat map of the difference between the two. <i>LacI</i> is heavily over-represented according to the difference matrix. <i>LacY</i> occurred less than would be expected according to a random distribution.</p
