Table 1.

Distribution and expression of Arabidopsis PG genes in duplicated regions

	Out of duplicated regions*		Within duplicated regions*
			With match†		Without match†
	Number of genes	Expression‡	Number of genes	Expression‡	Number of genes	Expression‡
Singular	4	3	11	9	27	21
Tandem	3	0	10	8	11	4
Total	7	3	21	17	38	25

*Duplicated regions are the regions that are covered by the AGI and BHW blocks. ^†The presence (with match) or absence (without match) of PGs in collinear regions of each duplicated block pair as shown in Figure 4 and Additional data file 4. ^‡Expression detected in at least two out of three RT-PCR reactions or supported by the presence of cDNA or EST tags.