Table 2.

Statistics of gene induction under various conditions

Category			Normoxia (plates 1–9)	Hypoxia (plates 10–24)	Chi2	Observations
A	Full-Term Placenta	Observed	12	26
		Expected	14,25	23,75	0,451	38
B	Early+Full-Term Placenta	Observed	9	31
		Expected	15	25	0,050	40
C	PE+RCIU	Observed	9	37
		Expected	17,25	28,75	0,012	46
D	PE+RCIU and isolated PE	Observed	10	10
		Expected	7,5	12,5	0,248	20
E	RCIU	Observed	6	9
		Expected	5,625	9,375	0,841	15
F	Isolated PE	Observed	2	35
		Expected	13,875	23,125	0,000	37
G	Early Term Placenta Hypoxia 48 h	Observed	45	36
		Expected	30,375	50,625	0,001	81

Each category (A-G) corresponds to a cluster of genes observed in figure 3 (a-b). The expected values were calculated from the proportion of clones in each subtracted library. Significant Chi2 values are represented in bold characters