Selective maintenance of Drosophilatandemly arranged duplicated genes during evolution

Table 1 Number of groups and genes that show co-expression in the D. melanogaster embryo

	Number of groups* (genes^†)	Number of co-expressing groups^‡ (genes^†)	Percentage of co-expressing groups (genes^†)
Conserved TDGs	52 (118)	19 (43)	36.5 (36.4)
Conserved non-TDGs^§	179 (578)	38 (89)	21.3 (15.4)
Conserved neighbors^¶	198 (716)	37 (107)	18.7 (14.9)

*Total number of groups where two or more genes have a reported in situ analysis. ^†Number of genes that have been analyzed by in situ. ^‡Number of groups where two or more genes show co-expression in at least one domain of the embryo. ^§Groups of duplicated genes that are not arranged in tandem and that have one-to-one orthologues in A. gambiae. ^¶Groups of genes that are located in syntenic regions between D. melanogaster and A. gambiae, that have one-to-one orthologues in A. gambiae, and that are not tandem duplicates.

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