[<i>PSI</i>] strain distribution of random spores.

n = 4 each. Percentages are averaged directly to obtain the mean and the standard deviation (SD). More than 200 random spores are analyzed for each experimental repeat. The 21w and VH strains are counted together (bottom row) due to their similar colony color. Their coexistence is verified by analyzing randomly selected colonies (see Methods: spore analysis).