Table 1. Fluorescence phenotypes and selection coefficients for the three mutants analyzed.

Mutant	Mean Effect
	%a	SDb	SDc	Selection Coefficientd
YPW89	+10.45%	+1.38	−5.33%	0.127
YPW94	+7.21%	+0.95	−13.8%	0.130
YPW102	−3.25%	−0.43	−7.49%	0.009

^aMean expression of mutant relative to wild type expressed as a percentage of change in fluorescence phenotype relative to wild type.

^bMean expression of mutant relative to wild type expressed as a number of wild type standard deviation (SD) from wild type mean.

^cStandard deviation (SD) of expression phenotype of the mutant strain relative to the reference strain.

^dSelection coefficient was measured using competitive growth of each mutant against the control population, as described in the Materials and Methods.