Table 2. Spore-killing activity of selected het-s mutants in a cross a with het-S male parent.

maternal parent in cross	2-spored asci/total counted asci	spore-killing (%)	p-value (significance of difference to wt)*
het-S	0/272	0	<0.0001
het-s wt	445/632	70.4	-
N226A	7/664	1	<0.0001
Q240A	0/425	0	<0.0001
E272A	328/746	44	<0.0001
K284A	31/506	5.8	<0.0001
D288A	190/509	37.3	<0.0001
T233A/S273A	311/836	37.2	<0.0001
E234A/R236A/E265A	94/654	14.4	<0.0001

*p-value is calculated in a two-tailed Fisher's test.