Algorithms for computing parsimonious evolutionary scenarios for genome evolution, the last universal common ancestor and dominance of horizontal gene transfer in the evolution of prokaryotes

Table 3 Distribution of numbers of events in parsimonious scenarios for randomized trees.

Gain penalty (g)	Numbers of events (mean/standard-deviation)
	Total	Loss	HGT	LUCA
g = 1	14446 / 180	5707 / 318	5543 / 223	650 / 42
Random g values: 0.750 – 1.250	14489 / 199	4498 / 1604	6825 / 1582	476 / 176
Random g values: 0.750–0.997	14479 / 227	2734 / 221	8578 / 185	289 / 30
Random g values: 1.002–1.230	14497 / 181	5847 / 420	5484 / 318	620 / 71

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