TABLE 1.

Genes differentially expressed for each of the 20 tests performed

Type	TP1	TP2	TP3	TP4	Global
FS/A	18	275	9	48	30
SS/A	44	4	12	46	19
D/A	147	21	117	88	19
FS/SS	6	344	2	0	6

One particular gene may be considered as differentially expressed in more than one comparison. Rows indicate the comparisons between two types of bacteria (FS/A, SS/A, D/A: FS and SS are considered as a single derived type; FS/SS: the indirect comparison between FS and SS). Each column corresponds to one point of comparison (TP1, -2, -3, -4, and global; all the points are pooled and considered as a single point). The various analyses were performed using different sample sizes (five microarray slides are indicated by roman, 10 slides by italic, 20 slides by underlining, and 40 slides by boldface type) and may thus result in different statistical power. TP, time point.