Table 1.

Gene Numbers at Different Expression Levels

	Vegetative cells			Sexual differentiation
Expression group	Pombe-specific	Yeast-specific	Core	Pombe-specific	Yeast-specific	Core
1/8	103	34	133	77	30	127
1/4	54	29	48	95	67	256
1/2	135	96	298	94	152	494
1	192	245	917	108	174	632
2	121	216	861	117	139	610
4	45	76	453	58	86	421
8	8	37	246	37	60	313
>8	5	30	299	77	55	402
Total	663	763	3255	663	763	3255

Genes were grouped into eight bins based on their normalized expression signals in either vegetatively growing or sporulating cells (see Fig. 1 and Methods). Gene numbers for each category and each expression group are shown. Gene numbers depend on the cutoffs used and represent estimates.