TABLE 2.

Spore length-to-width ratio of all strains comparing with parent strain M145

Strain name or description	n	Median	Mann-Whitney U test of difference		Variance	Levene’s test of equal variance
			U	P value		W	P value
M145	560	1.49			0.069
Δgbn	332	1.69	1.2 × 105	9.3 × 10−16	0.145	49.51	3.93 × 10−12
Δgbn+gbn	556	1.50	1.6 × 105	0.40	0.099	13.49	2.52 × 10−4
PermE-gbn	441	1.60	1.5 × 105	1.4 × 10−7	0.125	34.89	4.78 × 10−9