Evolution of gene fusions: horizontal transfer versus independent events

Table 3 Summary of evolutionary scenarios for cross-kingdom gene fusions

Evolutionary mode^*	Number of fusion-linked COG pairs
Cross-kingdom horizontal transfer of a fused gene	31
Independent fusion events	14
Ancestral fusion	2
Uncertain	4
Total	51

^*As indicated in Table 2, the evolutionary scenarios for some of the analyzed COGs included both cross-kingdom horizontal transfer and apparent independent gene fusion within one of the kingdoms.

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