There is an association between whether or not a WCC-responsive gene is light-responsive and the number of its LREs upstream.

WCC-responsive genes are classified as circadian and not light responsive or not circadian and light-responsive and by their number of putative upstream WCC-binding sequences (GATX sequences) or LREs. Observed (O) and Expected (E) counts of these genes under the hypothesis of no association are reported along with the chi-squared test of no association. See Fig. 11 for categories of genes being compared (N = 612 or 396).*The chi-squared statistic is X2 = 12.8445 with df = 3 and critical value C = 11.34 for α = 0.01. The residuals (O–E)/sqrt(E) of the starred counts make a large contribution to the X2.