Table 4.

Time to Most Recent Common Ancestor (TMRCA) and Ages of the Deepest Mutations in the psGBA Phylogeny

Mutation and TMRCA	Age, constant population	SD, constant population	Age, exponential population growth	SD, exponential population growth
TMRCA	199,000	58,600	91,000	17,000
3968	163,800	48,400	81,600	13,900
4274	99,460	67,500	44,800	24,400
2253	95,000	32,700	58,000	11,400
4938	74,400	26,600	49,900	10,100
2266	74,000	28,300	53,200	12,000

Times have been computed under constant population size and exponential growth models. Ages are given in years and have been calculated with a generation time of 20 yr, a population size of 7330 individuals under the constant population model, and a population size of 14,170 individuals under the exponential population growth model.