Table 1 . Summary of homozygous and heterozygous deletion set fermentation data.

	Reduced Fitness		Increased Fitness
	Heterozygous	Homozygous	Heterozygous	Homozygous
Total genes	481	300	466	303
Essential	116	0	111	0
Uncharacterized	52	24	38	32
Dubious	47	35	42	31