Table 1. Features of the k-means clusters from the time course experiment.

Cluster	Response	peak time (hrs)	number of genes	primary target genes		genes involved in transcription
				%	p *	%	p *
1	Up	4	28	75	0.251	38	0.026
2	Up	4	85	71	0.289	20	0.509
3	Up	4	255	64	0.909	17	0.845
4	Up	8	216	67	0.609	17	0.831
5	Down	12	210	74	0.009	14	0.973
6	Down	8	152	76	0.010	20	0.440
7	Down	4	213	57	0.100	20	0.399
8	Down	2	43	63	0.789	46	10−4

^* p-value from enrichment analysis.