Table 1.

Numbers of genes significantly differentially expressed relative to untreated B16 cells^a

	Retinoic Acid Treatment				melan-a vs. B16
	4 hour	10 hour	24 hour	48 hour
Upregulated	13	25	151	701	1495
Downregulated	1	3	3	734	2054
Total	14	28	154	1435	3549

^a Significance was determined by Significance Analysis of Microarrays (SAM) with median false discovery rate of 10%, and a minimum fold change of 1.5.